Know what to add.
Use your tank, current fuel, and pump percentages to plan your target blend.
Try the web calculator →Built for E85 drivers
Smarter fuel.
Better blends.
Calculate your blend, find nearby E85, and keep your vehicle’s fuel story in one place.
Free to downloadNo account requiredMade for iPhone
One app, every fill-up
Less guesswork. More driving.
From your first flex-fuel fill to your next road trip, keep the practical tools together.
Find your next stop.
Find E85 stations and community prices. Pro adds trip planning.
Explore station tools →Keep your setup close.
Save vehicle defaults, log fill-ups, and set service reminders.
See your everyday tools →- Flex-fuel owners
- Performance enthusiasts
- First-time E85 drivers
Made for the pump
Your blend, with a clearer plan.
Set a target, account for what’s already in the tank, and follow the gallons to add. Save your vehicle defaults in the iPhone app.
Preview · 2.4.0
Fuel information, closer at hand.
The upcoming 2.4.0 toolkit adds Pro Home Screen widgets and community ethanol reports. The public App Store version is currently 2.3.2.
Explore what’s new →Built around the community.
The 2.4.0 preview introduces measured ethanol reports and Refer & Earn, working toward a free Pro month for every 5 successful paid referrals.
See community features →Blend vs gasoline
Compare the cost of the drive.
Price per gallon is only part of the picture. Compare estimated driving costs using your prices and fuel economy.
Planning estimates only; real MPG varies. For existing fuel in your tank, use the full blend calculator.
E85 essentials: compatibility, pump content, and MPG
Use only blends supported by your vehicle manufacturer or equipment and tune. Pump ethanol content varies, and gasoline can contain ethanol too; use measured percentages where available. Higher ethanol blends can reduce MPG, so compare driving cost as well as price per gallon.
Free & Pro
Start free. Go further with Pro.
The everyday fueling tools are included. Pro adds more ways to plan, personalize, and keep E85 close at hand.
Included free
- Blend calculator & At The Pump
- Station finder & community prices
- Fuel log, reminders & iCloud sync
- One saved vehicle
Everything free, plus Pro
- Trip Planner & Pro Stations Map
- Map and Classic Stations layouts
- Unlimited saved vehicles
- Ad-free experience
Pro is purchased and managed in the iPhone app through the App Store. Monthly is the current public plan. The 3-month and annual options are 2.4.0 previews. Your App Store shows available plans, local pricing, and subscription terms.
See the full Free / Pro comparison
| Feature | Free | Pro |
|---|---|---|
| Blend calculator & At The Pump | Included | Included |
| Stations & community prices | Included | Included |
| Fuel log, reminders & iCloud sync | Included | Included |
| Saved vehicles | 1 vehicle | Unlimited |
| Trip Planner | Not included | Included |
| Pro Stations Map | Not included | Included |
| Nearby E85 widgets | Not included | 2.4.0 preview |
| Ad-free experience | Not included | Included |
Looking ahead: Price Alerts are planned for Pro, but are not a current included feature.
Partners & recommended gear
Built with the community.
RVPSupply · Founding Supporter
Automotive parts and enthusiast-focused gear from a supporter that helped 85Blends grow from an idea into a real app.
We highlight partners that support the 85Blends community. Product compatibility should always be verified with the supplier.
“I built the app I wished existed when I first started running E85.”Julian F. · Founder, 85Blends
Inspired by a flex-fuel Scat Pack build, 85Blends brings the tools Julian wanted into one app. Read our story →
A few useful answers
Before your next fill-up.
How much E85 do I need for E30?
It depends on tank capacity, the fuel already in the tank, its ethanol percentage, and the actual pump fuel. Calculate your blend using measured values when available.
Can my vehicle run E85?
Only use ethanol concentrations approved for your vehicle or supported by its equipment and tune. Follow your vehicle manufacturer or tuner guidance; the calculator does not determine compatibility.
Is 85Blends free?
Yes. The core calculator, At The Pump, stations, fuel log, reminders, and one vehicle profile are included free. Pro adds advanced tools and an ad-free experience.
Where do station reports come from?
Station discovery and community prices help you find fuel. Reports can become outdated; always verify pump labels and station details before fueling.
Need a hand? Visit support →
85Blends for iPhone
Ready for your next fill-up.
Bring your blend calculator, stations, vehicle profiles, and fuel history along for the drive.
Download on the App Store ↗Free to download. Optional Pro subscription.
