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MetroMPG · 08-04-2008, 10:16 AM

How are you measuring your fuel consumption? (Instrumentation?)

It's possible you're so far out of the ideal BSFC zone for that engine at low RPM in the highest gear that fuel consumption takes a hit (vs. same gear, higher RPM).

I've yet to see that in any instrumented car I've driven though, where the "lowest RPM in the highest gear" rule of thumb always seems to return the best fuel economy.

08-04-2008, 10:16 AM	#2 (permalink)
MetroMPG Batman Junior Join Date: Nov 2007 Location: 1000 Islands, Ontario, Canada Posts: 22,541 Blackfly - '98 Geo Metro Team Metro Last 3: 70.09 mpg (US) MPGiata - '90 Mazda Miata 90 day: 54.46 mpg (US) Appliance car Mirage - '14 Mitsubishi Mirage ES (base) 90 day: 51.82 mpg (US) Thanks: 4,085 Thanked 6,988 Times in 3,618 Posts	How are you measuring your fuel consumption? (Instrumentation?) It's possible you're so far out of the ideal BSFC zone for that engine at low RPM in the highest gear that fuel consumption takes a hit (vs. same gear, higher RPM). I've yet to see that in any instrumented car I've driven though, where the "lowest RPM in the highest gear" rule of thumb always seems to return the best fuel economy. __________________ Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata Honda mods: Ecomodding my $800 Honda Fit 5-speed beater Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage. Ecodriving test: Manual vs. automatic transmission MPG showdown EcoModder has launched a forum for the efficient new Mitsubishi Mirage www.MetroMPG.com - fuel efficiency info for Geo Metro owners www.ForkenSwift.com - electric car conversion on a beer budget