Hampton E85 Calculator
Perfect E85 mixes.
Every time.
Instant ethanol math for any car. Calculate the exact mix for your tank in seconds and stop guessing at the pump.
Built for the Tuning Community
Universal support for any vehicle running high ethanol blends.
Instant Ethanol Math
Enter tank size, current fuel level, pump ethanol percentage, and target mix. Get exact gallons to add with zero effort.
Estimated Octane Rating
See your estimated octane rating based on the mix. Know exactly what your engine is getting before you pull away from the pump.
Fuel Level Estimator
Use MPG and miles left in tank to calculate your current fuel percentage when your gauge is difficult to read.
Universal Mix Targets
Dial in any tuning target from E30 up to full E85 with a single tap. Compatible with any platform or ECU software.
Reliable Offline Use
No internet needed at the pump. All calculations happen instantly on device for fast results anywhere.
Built by Tuners
Developed by Hampton Tuning and real world tested by enthusiasts who breathe forced induction performance.
One seamless app for tuners.
- ✓Enter tank size, gas percentage, and ethanol percentage for exact results
- ✓Slide between E30 to E85 target mixes instantly
- ✓Use MPG and miles left in tank when your gauge is difficult to read
- ✓Results show E85 to add and gas to add side by side
- ✓Dark carbon fiber UI is easy to read in full sunlight
How to Use Hampton E85 Mix Calculator
Follow these steps to nail your ethanol blend every single time.
1. Verify Pump Ethanol Content
Start by identifying the actual ethanol content of the fuel at your local station. While common values are E80 and E10, these can vary by region and season. If you are unsure, use this simple and reliable kit for a precise reading: Easy Ethanol Test Kit.
2. Complete the App Workflow
Input your vehicle and fuel details into the designated fields:
- Enter your Tank Size (gal).
- Select your desired Target Mix (e.g., E30 to E85).
- Set your Current Fuel Level using the slider.
- Input the Ethanol % for both your pump gas and pump ethanol.
3. Get Precise Fuel Percentage
If your car's physical gauge is difficult to read or inaccurate, tap the "Help find my fuel %" button. Simply enter your vehicle's Average MPG and the Miles to Empty displayed on your dash to calculate your current percentage instantly.
4. Professional Mixing Tips
For the most consistent results, always add the calculated amount of high-ethanol fuel (E85) to your tank first, followed immediately by the required gallons of regular pump gas. This ensures thorough mixing as the tank fills.
