Calculate E30–E85 blends, find nearby stations, plan trips, and manage your flex-fuel build—all from your iPhone.
Whether you're daily driving a flex-fuel vehicle, chasing performance gains, or just curious about ethanol, 85Blends was designed to make E85 easier to use.
From first-time ethanol users to experienced tuners, 85Blends helps drivers confidently run E30–E85 blends.
E85 is a fuel blend of up to 85% ethanol and 15% gasoline. It's used by flex-fuel vehicles and performance builds where higher ethanol content can support better combustion control. But it's not as simple as just pulling up to a pump — ethanol content varies by location and season, and the cost and range math is different from regular gas.
E85 can contain anywhere from 51% to 83% ethanol depending on the region, pump, and time of year. Winter blends are sometimes lower to support cold starts. The label says E85 — what's actually in the tank can vary.
Ethanol has a higher octane rating than premium gasoline. In tuned or flex-fuel vehicles, this can allow for more aggressive timing and improved power output. The benefit depends entirely on whether your vehicle is set up to take advantage of it.
Ethanol contains less energy per gallon than gasoline, so fuel economy typically drops 15–30% on higher blends. A cheaper price per gallon does not always mean a cheaper fill-up — cost per mile is the number that actually matters.
Whether you're running a partial blend or full E85, 85Blends handles the math — so you know exactly what to add, what it'll cost per mile, and whether it makes sense for your next fill-up.
Try the calculator85Blends brings everything you need to run E85 confidently into one iPhone app.
Calculate the exact gallons of E85 and regular to hit your target blend—E30, E50, E85, or anywhere in between.
Explore →Already have fuel in the tank? Get exact partial-fill instructions to reach your target blend right at the pump.
Explore →Find nearby E85 stations, browse community-updated prices, and save your go-to locations.
Explore →Plan road trips with range estimates, required fuel stops, arrival reserve targets, and E85 station recommendations.
Explore →Explore everything included in 85Blends, from blend calculations and station discovery to trip planning, fuel logs, reminders, and Pro tools.
Explore All FeaturesDetailed screenshots, feature explanations, and Pro tools.
Compare E85 blend cost, range impact, and estimated cost per mile against gasoline.
Fill in tank size, E85 price, gas price, and MPG to see your cost comparison.
Actual MPG depends on tune, ethanol content, driving style, weather, and pump fuel quality. Use this as a planning estimate.
Use 85Blends on iPhone to calculate exact gallons to add, save vehicle defaults, find nearby E85, and log every fill-up.
Download on the App Store| Feature | Free | Pro |
|---|---|---|
| Blend Calculator | ✓ | ✓ |
| At The Pump | ✓ | ✓ |
| Station Finder | ✓ | ✓ |
| Fuel Log | ✓ | ✓ |
| Unlimited Vehicles | — | ✓ |
| Cloud Sync | — | ✓ |
| Trip Planner | — | ✓ |
| Price Alerts | — | ✓ |
I drive a 2017 Dodge Charger R/T Scat Pack and, after finally beginning to modify it, I decided to make the switch to E85 with a flex-fuel kit. The difference in performance completely changed the car and showed me just how capable ethanol blends can be.
As I learned more about E85, I found myself relying on my cousin for advice, searching for stations in my area, and using multiple blend calculators and apps. While there were some helpful tools available, many lacked features I personally wanted and would use every day.
That's what inspired me to create 85Blends.
My goal was to build one app dedicated to the entire E85 experience—helping drivers find nearby stations, calculate custom blends, track fuel usage, set maintenance reminders, and make ethanol easier to understand and use.
One of the biggest reasons behind 85Blends is education. Many owners of flex-fuel vehicles don't even realize E85 is an option for them. I wanted to create something that could help introduce more enthusiasts to ethanol and make getting started less intimidating.
85Blends is still growing, and I have many more ideas and features planned for the future. As the community grows, the app will continue evolving alongside it.
"I built the app I wished existed when I first started running E85."
85Blends gives you a cleaner way to plan your fuel mix and keep your setup organized.
