Flex fuel calculator

Hondata

Hondata
Elite Sponsor
Joined
Nov 27, 2015
Threads
99
Messages
911
Reaction score
2,498
Location
Torrance California
Website
www.hondata.com
Vehicle(s)
23' Type R,22' Civic Si,18' Accord 2.0T,17' FK8
Vehicle Showcase
1
Country flag
Using flex fuel the ECU will compensate for any ethanol content but we want to stay in the sweet spot of 40% ethanol for best performance.

If you are using flex fuel then it can be a guessing game when filling as to how much E85 vs gasoline you need. So we have made a calculator which you can use at the pump.

https://www.hondata.com/flex-fuel-calculator

For the calculator pump ethanol content is fairly easy to determine (0%, 10% or 15%), but E85 can be from 70% to 85% depending on location and time of year. In California we see 78-80% year round.

The fuel tank size for the FK8 is at around 12.5 gallons and when you estimate the current fuel level you will have to use a base line where empty has around 1.5 gallons in the tank still.
Sponsored

 

360glitch

Moderator
Joined
Feb 15, 2017
Threads
108
Messages
4,710
Reaction score
4,873
Location
USA
Vehicle(s)
2019 Accord Sport 2.0T, 2017 Si Sedan (Sold), 2017 Sport Hatchback (Sold)
Vehicle Showcase
1
Country flag
Great tool, thanks for sharing.
 

toddrhodes

Senior Member
First Name
Todd
Joined
May 21, 2018
Threads
20
Messages
705
Reaction score
754
Location
Indiana
Vehicle(s)
'18 CTR #16979, '18 Odyssey
Vehicle Showcase
1
Country flag
Not sure if a practical example helps here but I got FF up and running last night. Hit the pump just as the low fuel light came on, so I'm assuming that's 1.5 gallons left per Hondata's post.

I added:
5G E85
5.5G E10 93 octane

Landed at 39.84% ethanol content on the app gauge.

Oh and if you're fortunate enough to be able to do this before investing in mods? Congrats, you just saved yourself a great deal of money and time.
 

bobafettm

Senior Member
Joined
Jan 8, 2017
Threads
12
Messages
733
Reaction score
844
Location
Metro Detroit, MI
Vehicle(s)
2006 Lotus Exige; 2018 & 2021 Honda Type R
Country flag
Related but not... can you move from 93 to E85 on the same bill at your gas stations? I know I’ve had Chase reject a second pump back to back at the same location.
 

freezingmoon

Senior Member
First Name
Jon
Joined
Sep 18, 2018
Threads
14
Messages
104
Reaction score
56
Location
Brooklyn
Vehicle(s)
2018 civic si coupe
Country flag
This calculator is not working on any of my devices anymore... I type in the numbers and it doesn’t calculate, not sure if anyone else is having this same problem or not..
 

TypeSiR

Senior Member
Joined
May 15, 2017
Threads
67
Messages
2,091
Reaction score
1,689
Location
On a Twisty Road
Vehicle(s)
1.5T Civic, Fit, MX-5, CTR
Vehicle Showcase
3
Country flag


 


Top