2-Stroke Mix Ratio Statistics: 61 Models (2026 Data)

The headline figure is lopsided: 59 of 61 current 2-stroke models (97%) state a 50:1 gas-to-oil mix in their manufacturer’s own documentation, and every one of the 59 handheld and backpack machines from Stihl, Echo, Husqvarna and RedMax does. The only exceptions in the set are two dirt bikes. This page publishes that count, the tank sizes behind it and what they mean in oil per fill, plus the storage limits the same manufacturers print for mixed fuel. Data checked 2026-10-24; every row links to the page or manual it came from, and the whole set downloads as a CSV.

Key figures

• 61 models from 5 brands: 24 chainsaws, 15 string trimmers and brushcutters, 2 multi-tool powerheads, 6 handheld blowers, 12 backpack blowers, 2 dirt bikes.
• 59 of 61 state 50:1. The other 2 are the 2027 Yamaha YZ125 and YZ250, at 30:1.
• 33 of 61 ratios come from the model’s own page or manual; the other 28 rest on a brand-wide statement (all 23 Stihl rows, 5 Echo rows).
• 44 of 61 models have a published fuel tank size. Stihl lists tank capacity for its trimmers only.
• A median chainsaw tank (0.44 L, n = 15) holds 8.8 ml of oil at 50:1; a median backpack blower tank (2.1 L, n = 9) holds 42 ml.

Mix ratio by model

Stated ratio	Models	Share
50:1	59	96.7%
30:1	2	3.3%

The chart is free to reuse under CC BY 4.0. Download it as PNG or SVG.

What the 50:1 count does and does not say matters more than the count. It says that a buyer of a current saw, trimmer or blower from Stihl, Echo, Husqvarna or RedMax will be told 50:1. It does not say every 2-stroke engine runs 50:1: the set has no older equipment, no budget brands (no Poulan, Craftsman, Ryobi or Homelite page published a readable spec), no outboards and only two motorcycles. Those are exactly the places where 40:1 and 32:1 still live, which is why the 40:1 vs 50:1 guide exists.

Two manufacturer caveats sit inside the 50:1 rows. Husqvarna’s how-to-mix article recommends 50:1 “for Husqvarna products up to and including 75cc”; every Husqvarna engine in the set is under 75 cc. Echo’s current manuals say Echo-branded 2-stroke oil “may be mixed at 50:1 ratio for application in all ECHO engines sold in the past regardless of ratio specified in those manuals”, which confirms that older Echo manuals printed other ratios.

By machine type

Machine	Models	At 50:1	With tank size	Median tank	Tank range	Oil per full tank (median)	Full tanks per US gallon
Chainsaws	24	24	15	0.44 L (14.9 fl oz)	0.24 to 0.74 L	8.8 ml	8.6
String trimmers and brushcutters	15	15	15	0.51 L (17.2 fl oz)	0.3 to 1 L	10.2 ml	7.4
Multi-tool powerheads	2	2	0	not published
Handheld blowers	6	6	3	0.5 L (16.9 fl oz)	0.5 to 0.55 L	10 ml	7.6
Backpack blowers	12	12	9	2.1 L (71 fl oz)	1.25 to 2.48 L	42 ml	1.8
Dirt bikes	2	0	2	7 L (236.7 fl oz)	7 to 7 L	233.3 ml	0.5

Oil per full tank is the tank volume divided by the model’s stated ratio. It is the number that explains why mixing in the machine’s tank goes wrong: a median saw needs 8.8 ml, so pouring 2 ml too much or too little turns 50:1 into 41:1 or 65:1. In a gallon can the same 2 ml error moves the ratio by less than one point. Mix in the can, and use the calculator or a ratio bottle for the amount.

The last column is how many full tanks one US gallon of mix fills. A trimmer owner who fills up once a week is still working through a gallon two months later, which collides with the storage limits further down. A backpack blower empties the same gallon in under two fills.

By brand

Brand	Models	Stated ratio	Where the ratio comes from
Stihl	23	50:1	brand-wide statement
Echo	16	50:1	model pages, plus a brand-wide statement where no manual was linked
Husqvarna	16	50:1	each model's page or manual
RedMax	4	50:1	each model's page or manual
Yamaha	2	30:1	each model's page or manual

Stihl is the brand where every ratio is brand-wide, because its product pages do not state a ratio and its US manual PDFs could not be downloaded for this check. Its US mixing guide says both “All STIHL gasoline-powered equipment uses a 50:1 gas and oil mixture” and, a few lines away, “Most STIHL gasoline-powered equipment runs on a 50:1 mixture”. The brand pages on this site go deeper: Stihl oil, Husqvarna oil, Echo oil.

How long mixed fuel keeps, by manufacturer

The same manufacturers publish storage limits, and they disagree more than they do on ratio. 14 published statements, quoted:

Brand	Document or product	What it says
Stihl	STIHL USA fuel FAQ (pump gas mix)	"STIHL currently recommends that you do not store or use fuel older than 60 days, and preferably no longer than 30 days, even with a stabilizer."
Stihl	STIHL MotoMix premixed fuel (FAQ)	"STIHL MotoMix® contains no ethanol and has a storage life of up to two years. STIHL MotoMix® can be left in the machine during seasonal storage."
Stihl	STIHL USA 'How to mix oil and gas' guide	"It is recommended that you only mix sufficient fuel for a few days' work. Fuel storage should never exceed three months."
Stihl	STIHL USA extended storage tips	"Standard pump gasoline quickly deteriorates and should not be kept over 30 days in any season."
Echo	ECHO CS-4010 operator's manual (same wording in other current ECHO manuals)	"Do not mix more fuel than you expect to use in 30 days or 90 days when a fuel stabilizer is added."
Echo	ECHO Red Armor Fuel (premix 50:1)	"Stays stable 2 years after opening and up to 5 years unopened"
Echo	ECHO Red Armor 2-stroke oil	"Allow mixed fuel to remain stable up to 2 years in a properly-sealed container"
Echo	ECHO Red Armor Fuel Treatment	"Keep fuel fresh for up to 2 years in a properly-sealed container"
Husqvarna	Husqvarna 435/440 operator's manual	"Do not mix fuel for more than 1 month at a time."
Husqvarna	Husqvarna 'How to mix 2-stroke fuel' article	"Avoid storing mixed two-stroke fuel for more than one month. ... fuel stabilizers ... may extend the shelf life up to twelve months."
Husqvarna	Husqvarna 2-Stroke Pre-Mixed Fuel + Oil	"Easy starting with fuel that stays fresh for years."
TruFuel	TruFuel premix (FAQ)	"TRUFUEL is packaged in a sealed container that ensures high performance for a minimum of 2 years from the time you open the can and for more than 5 years unopened."
Sta-Bil (Gold Eagle)	STA-BIL Fuel Stabilizer	"Keeps fuel fresh for long term storage – up to 24 months"
Yamaha	YZ125 2027 owner's manual	"mix the oil and gas the day of the race. Do not use premix that is more than a few hours old."

Read together: mix made from ethanol pump gas is a 30-day product by most of these sources, 60 to 90 days at the outside with a stabilizer, and Stihl contradicts itself between its fuel FAQ (60 days, preferably 30) and its mixing guide (three months). Sealed, ethanol-free canned premix is rated in years. Yamaha’s race manual is the strictest of all: mix on the day. The winterizing guide turns those limits into a storage routine.

Every model in the dataset

Brand	Model	Type	Engine	cc	Fuel tank	Ratio	Oil per tank	Source
Stihl	MS 172	Chainsaws	two-stroke	31.8	not published	50:1		spec, ratio
Stihl	MS 180	Chainsaws	two-stroke	31.8	not published	50:1		spec, ratio
Stihl	MS 182	Chainsaws	two-stroke	35.8	not published	50:1		spec, ratio
Stihl	MS 250	Chainsaws	two-stroke	45.4	not published	50:1		spec, ratio
Stihl	MS 271	Chainsaws	two-stroke	50.2	not published	50:1		spec, ratio
Stihl	MS 291	Chainsaws	two-stroke	55.5	not published	50:1		spec, ratio
Stihl	MS 362 C-M	Chainsaws	two-stroke	59	not published	50:1		spec, ratio
Stihl	MS 462 C-M	Chainsaws	two-stroke	72.2	not published	50:1		spec, ratio
Stihl	MS 500i	Chainsaws	two-stroke	79.2	not published	50:1		spec, ratio
Echo	CS-271T	Chainsaws	two-stroke	26.9	0.24 L	50:1	4.8 ml	spec, ratio
Echo	CS-310	Chainsaws	two-stroke	30.5	0.251 L	50:1	5 ml	spec, ratio
Echo	CS-355T	Chainsaws	two-stroke	35.8	0.331 L	50:1	6.6 ml	model, ratio
Echo	CS-4010	Chainsaws	two-stroke	41.6	0.349 L	50:1	7 ml	model, ratio
Echo	CS-4920	Chainsaws	two-stroke	50.1	0.479 L	50:1	9.6 ml	model, ratio
Echo	CS-590 Timber Wolf	Chainsaws	two-stroke	59.8	0.645 L	50:1	12.9 ml	model, ratio
Echo	CS-620P	Chainsaws	two-stroke	59.8	0.645 L	50:1	12.9 ml	model, ratio
Husqvarna	120 Mark II	Chainsaws	two-stroke	38	0.3 L	50:1	6 ml	model
Husqvarna	435	Chainsaws	two-stroke	40.9	0.37 L	50:1	7.4 ml	model
Husqvarna	440	Chainsaws	two-stroke	40.9	0.37 L	50:1	7.4 ml	model
Husqvarna	450 Rancher	Chainsaws	two-stroke	50.2	0.45 L	50:1	9 ml	model
Husqvarna	455 Rancher	Chainsaws	two-stroke	55.5	0.44 L	50:1	8.8 ml	model
Husqvarna	460 Rancher	Chainsaws	two-stroke	60.3	0.44 L	50:1	8.8 ml	model
Husqvarna	562 XP	Chainsaws	two-stroke	59.8	0.65 L	50:1	13 ml	model
Husqvarna	572 XP	Chainsaws	two-stroke	70.6	0.74 L	50:1	14.8 ml	model
Stihl	FS 111	String trimmers and brushcutters	4-MIX		0.71 L	50:1	14.2 ml	spec, ratio
Stihl	FS 131	String trimmers and brushcutters	4-MIX	36.3	0.71 L	50:1	14.2 ml	spec, ratio
Stihl	FS 38	String trimmers and brushcutters	two-stroke	27.2	0.33 L	50:1	6.6 ml	spec, ratio
Stihl	FS 56	String trimmers and brushcutters	two-stroke	27.2	0.34 L	50:1	6.8 ml	spec, ratio
Stihl	FS 70	String trimmers and brushcutters	two-stroke	27.2	0.34 L	50:1	6.8 ml	spec, ratio
Stihl	FS 91	String trimmers and brushcutters	4-MIX	28.4	0.71 L	50:1	14.2 ml	spec, ratio
Echo	GT-225	String trimmers and brushcutters	two-stroke	21.2	0.379 L	50:1	7.6 ml	model, ratio
Echo	SRM-225	String trimmers and brushcutters	two-stroke	21.2	0.379 L	50:1	7.6 ml	spec, ratio
Echo	SRM-2620	String trimmers and brushcutters	two-stroke	25.4	0.609 L	50:1	12.2 ml	model, ratio
Echo	SRM-266	String trimmers and brushcutters	two-stroke	25.4	0.5 L	50:1	10 ml	spec, ratio
Echo	SRM-410U	String trimmers and brushcutters	two-stroke	42.7	1 L	50:1	20 ml	model, ratio
Husqvarna	122L	String trimmers and brushcutters	two-stroke	21.7	0.3 L	50:1	6 ml	model
Husqvarna	130L	String trimmers and brushcutters	two-stroke	28	0.53 L	50:1	10.6 ml	model
Husqvarna	525L	String trimmers and brushcutters	two-stroke	25.4	0.51 L	50:1	10.2 ml	model
RedMax	BCZ265S	String trimmers and brushcutters	two-stroke	25.4	0.65 L	50:1	13 ml	model
Stihl	KM 131 R	Multi-tool powerheads	4-MIX	36.3	not published	50:1		spec, ratio
Stihl	KM 56 RC-E	Multi-tool powerheads	two-stroke	27.2	not published	50:1		spec, ratio
Stihl	BG 50	Handheld blowers	two-stroke	27.2	not published	50:1		spec, ratio
Stihl	BG 56	Handheld blowers	two-stroke	27.2	not published	50:1		spec, ratio
Stihl	BG 86	Handheld blowers	two-stroke	27.2	not published	50:1		spec, ratio
Echo	PB-2520	Handheld blowers	two-stroke	25.4	0.55 L	50:1	11 ml	model, ratio
Husqvarna	125B	Handheld blowers	two-stroke	28	0.5 L	50:1	10 ml	model
RedMax	HB281	Handheld blowers	two-stroke	28	0.5 L	50:1	10 ml	model
Stihl	BR 600	Backpack blowers	4-MIX	64.8	not published	50:1		spec, ratio
Stihl	BR 700	Backpack blowers	4-MIX	64.8	not published	50:1		spec, ratio
Stihl	BR 800 C-E	Backpack blowers	4-MIX	79.9	not published	50:1		spec, ratio
Echo	PB-580T	Backpack blowers	two-stroke	58.2	1.834 L	50:1	36.7 ml	model, ratio
Echo	PB-770T	Backpack blowers	two-stroke	63.3	2.02 L	50:1	40.4 ml	model, ratio
Echo	PB-9010T	Backpack blowers	two-stroke	79.9	2.478 L	50:1	49.6 ml	spec, ratio
Husqvarna	150BT	Backpack blowers	two-stroke	51.7	1.26 L	50:1	25.2 ml	model
Husqvarna	350BT	Backpack blowers	two-stroke	50.2	1.25 L	50:1	25 ml	model
Husqvarna	360BT	Backpack blowers	two-stroke	65.6	2.2 L	50:1	44 ml	model
Husqvarna	570BTS	Backpack blowers	two-stroke	65.6	2.2 L	50:1	44 ml	model
RedMax	EBZ7500	Backpack blowers	two-stroke	65.6	2.1 L	50:1	42 ml	model
RedMax	EBZ8560	Backpack blowers	two-stroke	75.6	2.3 L	50:1	46 ml	model
Yamaha	YZ125 (2027)	Dirt bikes	two-stroke	125	7 L	30:1	233.3 ml	model
Yamaha	YZ250 (2027)	Dirt bikes	two-stroke	249	7 L	30:1	233.3 ml	model

Methodology

What was collected. For each model: brand, model, machine type, engine type (two-stroke, Stihl 4-MIX, or oil-injected), displacement, fuel tank capacity as published and converted to litres, the stated gas-to-oil ratio, whether that ratio is stated for the model or for the whole brand, and the URL of every source. Sources were manufacturer product pages and operator’s manuals only; no retailer listings, forums or dealer pages. Stihl displacement came from Stihl Australia, UK and Canada pages because stihlusa.com rounds it to 0.1 cubic inch. Data was read on 2026-10-24.

Which models. The current gas saws, trimmers, multi-tool powerheads and blowers that the four handheld brands list on their US sites (with non-US Stihl pages for specs), chosen from each brand’s homeowner to professional range, plus the 2027 Yamaha YZ125 and YZ250 owner’s manuals. Models no longer on the manufacturer’s site were dropped rather than filled from old listings.

Where two official sources conflict, the conflict is recorded in the row’s note in the CSV: the Echo SRM-2620 page lists a 20.6 fl oz tank against 0.56 L in its manual (the page figure is used), the Echo GT-225 manual gives three tank sizes by serial range (the page’s 12.8 fl oz is used), and Husqvarna’s 125B page shows 18.5 fl oz beside 0.5 L (the manual’s 0.5 L is used).

What was not measured. Nothing here was tested on an engine. The ratios are what manufacturers tell owners, not what engines need, and not what oil makers print on bottles. The set is not a market sample: it has no sales weighting, no older or used equipment, no budget brands, no outboards and no oil-injected engines, and Makita, Ryobi and Poulan Pro were excluded only because no readable manufacturer spec page was found. Tank capacity is missing for 17 models, almost all Stihl. Displacement and tank figures are as published and inherit any rounding in the source.

Download and reuse

• CSV: 2-stroke-mix-ratios.csv, one row per model with every field above plus computed oil per full tank and tanks per US gallon.
• Chart: PNG, SVG.
• License: CC BY 4.0. Credit “2cycleoilmixcalculator.com 2-stroke mix ratio statistics” with a link to this page.

The figures are rebuilt from the dataset every time the site is built, so the tables, the CSV and the chart always match. If a manufacturer changes a spec or you find a row that disagrees with its source, the contact page reaches the editor, and the row will be corrected with a note. For turning any of these ratios into an amount for your can, the 2-stroke mix chart and the 50:1 page have the tables.