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Superfuelgero · 02-10-2014, 08:16 PM

Electrical drain from the heater and lights is part of it. this is especially true at lower rpms where the electrical load detector (ELD) commands full alternator power. A higher ELD signal to the ecu will also raise you idle speed.
The other is the slower time to get up to temp (especially if running the heater). Lean burn (LB) is engine temp limited in the lower gears (ie: too cold, won't LB).

Plus the whole minor difference in air density (air drag and pumping losses), but again, its minor.

02-10-2014, 08:16 PM	#6 (permalink)
Superfuelgero Too busy for gas stations Join Date: May 2013 Location: The intersection of TN/MS/AL Posts: 460 Turtle - '92 Honda Civic Vx Team Honda 90 day: 67.09 mpg (US) Rolla - '10 Toyota Corolla Le Beast - '91 Chevy V2500 Bus - '01 VW Eurovan MV Speed - '93 Harley bored and storked Harley w/ turbo/ nitrous 90 day: 53.09 mpg (US) Cal - '68 Ford Mustang GT/CS Thanks: 87 Thanked 176 Times in 114 Posts	Electrical drain from the heater and lights is part of it. this is especially true at lower rpms where the electrical load detector (ELD) commands full alternator power. A higher ELD signal to the ecu will also raise you idle speed. The other is the slower time to get up to temp (especially if running the heater). Lean burn (LB) is engine temp limited in the lower gears (ie: too cold, won't LB). Plus the whole minor difference in air density (air drag and pumping losses), but again, its minor. __________________ Shooting for 600 miles of range at 65-70 mph out of a vx. Last edited by Superfuelgero; 02-10-2014 at 08:28 PM..