E85 Ethanol Fuel Calculator - Mix Calculator for E85 and Gasoline
Ethanol Fuel Calculator
Calculate the optimal ethanol-gasoline mixture for your vehicle. Mix E85, E98, or other ethanol fuels to achieve your desired ethanol percentage.
Calculator
Results
Fuel to add: 0.00 liters
Total in tank: 0.00 liters
Fuel Reference
| Fuel Type | Ethanol % | Gasoline % |
|---|---|---|
| E5 | 5 | 95 |
| E10 | 10 | 90 |
| Sunoco Green E15 | 15 | 85 |
| VP Racing Fuels C25 | 25 | 75 |
| E50 | 50 | 50 |
| E85 | 85 | 15 |
| E85 Race Fuel | 85 | 15 |
| VP Racing Fuels C85 | 85 | 15 |
| Sunoco E85-R | 85 | 15 |
| Rockett Brand E85-R | 85 | 15 |
| Renegade Race E85 | 85 | 15 |
| Renegade Pro E85 | 85 | 15 |
| E98 | 98 | 2 |
| Renegade Race E98 | 98 | 2 |
How To Use
1. Select Units
Choose between liters or gallons for your measurements.
2. Enter Tank Info
Input your tank capacity and current fuel volume.
3. Set Ethanol Levels
Enter current and desired ethanol percentages.
4. New Fuel Content
Specify the ethanol % of the fuel you're adding (default E85).
5. Check Results
View how much fuel to add and total volume.
6. Safety First
Always verify vehicle compatibility with ethanol fuels.
Safety & Disclaimer
Calculator Disclaimer
This calculator is for informational purposes only. Verify all calculations independently and ensure vehicle compatibility before use.
Safety Guidelines
- Check vehicle manual for ethanol compatibility
- Handle fuel safely - no flames or sparks
- Use approved fuel containers only
- Keep away from children and pets
Ethanol Fuel FAQs
What is E85 fuel?
E85 is a fuel blend containing 85% ethanol and 15% petrol. It is commonly used in flex fuel vehicles and performance applications due to its high octane rating, which allows for increased boost and ignition timing for more power output.
Can I mix E85 with regular petrol?
Yes, E85 can be mixed with regular petrol to achieve a custom ethanol percentage. This is common in flex fuel and performance tuning setups. Use the calculator above to determine exactly how much E85 to add to reach your desired ethanol content.
What ethanol percentage is best for performance?
The optimal ethanol percentage depends on your engine setup, tune, and fuel system components. Many performance builds target E30 to E50 as a balance between power gains and fuel system compatibility. Full E85 or E98 is used in purpose-built race engines with appropriate injectors, fuel pumps, and ECU calibration.
Does ethanol damage fuel system components?
High ethanol concentrations can degrade rubber seals, hoses, and older fuel system components not designed for ethanol compatibility. Before running high ethanol blends, verify that your fuel injectors, fuel pump, fuel lines, and seals are all rated for ethanol use.
What is the difference between E85 and E98?
E85 contains approximately 85% ethanol and 15% petrol, while E98 contains approximately 98% ethanol and just 2% petrol. E98 is used almost exclusively in purpose-built race applications and requires significantly larger injectors and fuel pumps due to the greater fuel volume needed compared to petrol.