null
close
close

ID Tech Support

Need help updating your unit. loading tunes to your device or logging. No problem, these helpful links will get you back to enjoying your vehicle as you should be.

Having trouble with our SCT or Bully Dog Device or software?  Check out the SCT Support Portal.

Having trouble with your HP Tuners Device or software?  Check out the HPT Support Portal.

Having trouble with your Diablosport, Superchips, Edge, or Holley Device or software?  Check out the Diablo Support Portal.

 

E85 Calculator - Ethanol Mix


How to use this Calculator

Use this calculator for these situations:

  • You have a completely empty fuel tank, and plan on filling up with a specific ethanol/gas mixture
  • You already have an ethanol mixture in the tank, and want to fill up while keeping the same mixture (i.e. you have E30 in the tank and want to add ten more gallons of E30)
  • You aren't as concerned with precise mixtures, octane ratings, or need to make any manual adjustments to the fuel specifics

Enter the number of total amount of fuel you need to fill up with in the "Gallons to Fill" box. Then, select your desired mixture in the dropdown - if you have a custom tune from us, we most likely specified something like "E30" or "E50" to use. Now press the "Calculate Mix" button, and the results are displayed to the right. Simply add the amount specified by each fuel type to achieve that mixture.
This calculator also makes the following assumptions:

  • Your E85 fuel has an ethanol content of 85%
  • Your Gasoline has an ethanol content of 10%
Gallons To Fill:
Desired Ethanol Mix:
E85 Gallons:
0
Gas Gallons:
0

For every 1 Gallon of Ethanol, add 0 Gallons of Gasoline.

Advanced Calculator

Use this calculator for these situations:

  • You already have some gasoline in your tank, and want to add some ethanol to achieve a desired mixture
  • You are interested in calculating the estimate octane in different mixture amounts
  • Fuel in your area has different ethanol contents - for example, "E85" with 70% ethanol, or pure gasoline with 0% ethanol, etc

For the first (and likely most common) scenario, simply enter the number of gallons of gasoline you think you have in your fuel tank, to your best approximation. Then, add in a number for gallons of ethanol and click the "calculate fuel" button. This will display your specific ethanol mixture - E30, E35, E36, etc. If your desired ethanol mix is lower, decrease the gallons you entered for "E85 Gallons" and click the "calculate fuel" button again. Use this to estimate how much E85 you will need to put in to get the desired mixture.

Starting from the left column:
  • E85 Gallons - the amount of E85 fuel to be used
  • Gas Gallons - the amount of gasoline to be used
For the center column:
  • E85 Octane - This can fluctuate based on the fuel station. In the US, it is usually rated anywhere from 100 to 105 octane, but it should display the exact number on the pump.
  • Gas Octane - Enter your gasoline's octane here. The mixture still benefits from using higher octane gas, since the limiting factor is the ethanol content of the fuel, not the octane. Adding ethanol is not a substitute for higher octane gasoline, it should be added to increase the octane of an already premium fuel (preferably 93US / 98RON, but 91US / 95RON will do). For example, using 87 octane gas to make an E30 mixture results in an octane rating similar to plain premium gas, but with a higher price, hassle of mixing, and lower fuel economy.
For the right column:
  • E85 Ethanol % - This is the exact ethanol content of the fuel you are using. In the US, "E85 fuel" isn't always 85% ethanol, it can be anywhere from 51%-85%. The fuel provider should show the ethanol content of each fuel at the pump.
  • Gas Ethanol % - Most gasoline in the US has around 10% ethanol content. If you have access to ethanol-free gas, change this number to 0, or adjust as necessary.
After filling out each box (default values already placed for you), click the "Calculate Fuel" button. This will fill out the bottom row with the calculated results, showing the total number of gallons specified, the estimated octane rating of the fuel mixture, and the ethanol content amount.

Special note for non-US customers: fuel in the US is measured with the formula (RON+MON)/2. Most fuels elsewhere are measured only in RON (98 RON, 95RON, etc). This does not affect the calculations - simply enter in the octane of your local petrol and ethanol fuels and it will return the correct result (in RON).

E85 Gallons:
Gas Gallons:

Total Gallons: ?
E85 Octane:
Gas Octane:

Octane Rating: ?
E85 Ethanol %:
Gas Ethanol %:

Ethanol Mixture: ?

Note: All data extrapolated from these calculators are purely estimates. While we strive to provide accurate data, we are not liable for any damages, issues, or incidents caused by the use of the tools provided on our website.

Technical Support Information Articles and Frequently Asked Questions:

 

Ford 6.0L Powerstroke:

 

 

 

Loading a Custom Config File to your SCT Device

 

Pilot Injection for the Ford 6.0L Powerstroke

 

What is Transmission Tuning and why is it important?

 

Ford 6.0L VGT Turbo Operation

 

Ford 6.0L Switch on the Tuning (SOTF) and how it works

 

How to determine a boost leak in your Powerstroke

 

How to display Fuel Pressure on your SCT Livewire

 

Why upgrade the EGR Cooler on your Ford 6.0L Powerstroke?

 

What is the P132B code on my Ford Powerstroke?

 

How to install an EGT Probe in your truck

 

High Idle Mod for your 6.0L Powerstroke

 

What is Cylinder Pressure and how it impacts longevity?

 

Installing and using upfitter switches in your 6.0L Powerstroke

 

What is the EBP Sensor and inferred map on a Powerstroke?

 

Does your Ford 5R110 Transmission need a relearn procedure?

 

Ford 6.0L Powerstroke Maintenance information

 

Ford Powerstroke DTC Codes and their meaning

 

Ford 6.0L Powerstroke No Start Condition and how to diagnose and repair

 

FICM guide for your Powerstroke

 

Ford Powerstroke 6.0L  Switch on the Fly (SOTF) Information

 

Do I need an External Oil Cooler in my 6.0L Powerstroke?

 

Ford 6.0L Resources for Diagnostics and Repair

 

Ford 6.0L Powerstroke Cold Start, No Start, weather related issues

 

HP Tuners TDN and How to Use it

 

 

Ford Powerstroke 6.7L:

 

Ford Powerstroke 6.7L CP4 Bypass kit and how it works

 

Transmission tuning and why it's so important

 

 

Gas Vehicles:

 

Installing a Ford Racing Cobra Jet Intake on your 18+ Mustang

 

2020+ Ford Shelby GT500 Dyno Horsepower gains with modifications

 

Hellcat Supercharger Pulley Installation Information

 

What is Ford OAR Adjustable Octane Ratio and what does it do?

 

Dodge Jeep Hellcat Belt Size guide for Pulley Installation

 

 

Fast Shipping
Wide Selection of Parts
Secure Shopping
No Hassle Ordering