E85 MPG - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

bdtbdtbdt · 08-13-2023, 06:39 AM

Does the OFT v 4.03 E85 tune correct for worse mileage in the dashboard MPG readout? Is it accurate for E85. Thanks all, great forum

elBarto · 08-13-2023, 09:47 AM

Quote:

Originally Posted by bdtbdtbdt

Does the OFT v 4.03 E85 tune correct for worse mileage in the dashboard MPG readout? Is it accurate for E85. Thanks all, great forum

No, doesn't correct for E85. Wayno tunes do.

Grady · 08-19-2023, 11:14 AM

Is there a correction needed? Isn’t the system measuring volume of fuel per mile? E85, or normal gas, a gallon is a gallon.

lightning · 08-29-2023, 01:09 PM

There is an adjustment needed, but the latest oft roms should have it already. It's needed because the mileage display is based on fuel rail pressure which isn't changed by an e85 tune. It's called fuel display multiplier offset in my RR definitions, under misc.-other.

08-13-2023, 06:39 AM	#1
bdtbdtbdt Member Join Date: Aug 2015 Drives: 2015 Scion FRS Location: Dutchess County N.Y. USA Posts: 43 Thanks: 15 Thanked 16 Times in 8 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	E85 MPG Does the OFT v 4.03 E85 tune correct for worse mileage in the dashboard MPG readout? Is it accurate for E85. Thanks all, great forum

08-29-2023, 01:09 PM	#4
lightning Junior Member Join Date: Jun 2020 Drives: 2014 BRZ Location: New York Posts: 7 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	There is an adjustment needed, but the latest oft roms should have it already. It's needed because the mileage display is based on fuel rail pressure which isn't changed by an e85 tune. It's called fuel display multiplier offset in my RR definitions, under misc.-other. Attached Images

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