The E85 field guide
Flex-fuel guides & calculators
Straight answers for E85 drivers — finding it, pricing it, and blending it right. From the team behind E85 App.
Is E85 actually cheaper than gas?
The per-gallon price is only half the story. Here's how to know if E85 really saves you money — using cost per mile, not the pump sticker.
● FINDINGHow to find E85 stations near you
Where E85 hides, why generic gas apps miss it, and how to find the cheapest verified E85 around you — including by state.
● BLENDINGHow to mix E85 with premium (E30, E50)
The exact math to blend E85 with 91/93 to hit a target ethanol % — and why the real pump ethanol content changes the recipe.
● TRUTHYour "E85" probably isn't 85% ethanol
E85 is legally 51–83% ethanol and drifts by season. What that means for your octane, your MPG, and your blend.
● FFVWhat cars can use E85?
How to tell if your car is flex-fuel, common FFV models, and what happens if you put E85 in a regular car.
● POWERE85 vs 93 octane
Which is better for power and cost — and why a lot of tuners just blend the two.
● SAFETYDoes E85 damage your engine?
Safe by design in a flex-fuel car — a real risk in a non-FFV. The honest breakdown.
● ECONOMYE85 gas mileage: how much MPG do you lose?
Expect 15–27% fewer MPG — and why E85 can still be cheaper per mile.
● POWERE85 horsepower gains
How much power E85 really adds on a boosted, tuned engine — and what you need first.
● SEASONALE85 in winter
Why winter "E85" isn't 85%, how it affects cold starts, and what to do.