Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Driving 55mph? (Is it the most efficient speed?)

Big Dave · 03-11-2008, 08:40 PM

My old diesel has a very flat BSFC curve from 800-2000 RPM. That plus its outrageous low-end torque allows me to think of truly radical gearing.

With an add-on overdrive I can cruise 70 MPH @ 1350 RPM and 60 MPH @ 1050 RPM. Aero mods will reduce the road load at these speeds and I'll have good roll-on capability even at ridiculously low RPM.

03-11-2008, 08:40 PM	#10 (permalink)
Big Dave Master EcoModder Join Date: Jan 2008 Location: Steppes of Central Indiana Posts: 1,319 The Red Baron - '00 Ford F-350 XLT 90 day: 27.99 mpg (US) Impala Phase Zero - '96 Chevrolet Impala SS 90 day: 21.03 mpg (US) Thanks: 0 Thanked 186 Times in 127 Posts	My old diesel has a very flat BSFC curve from 800-2000 RPM. That plus its outrageous low-end torque allows me to think of truly radical gearing. With an add-on overdrive I can cruise 70 MPH @ 1350 RPM and 60 MPH @ 1050 RPM. Aero mods will reduce the road load at these speeds and I'll have good roll-on capability even at ridiculously low RPM. __________________ 2000 Ford F-350 SC 4x2 6 Speed Manual 4" Slam 3.08:1 gears and Gear Vendor Overdrive Rubber Conveyor Belt Air Dam