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EOC has a surprisingly large effect on mpgs when you're hypermiling. If you're averaging 60 mpg with EOC P&G, engine on 1/5 of the time, and averaging 30 mph, you're using .5 gal. on a one hour, 30 mile drive. If you NICE-on glide, your engine idles unnecessarily at at least .15 gph for 4/5 of that time. For a fuel-sipper like my Scion's 1NZ-FE engine, it drinks an additional .12 gal. in 48 minutes of idling time. My 60 mpg (30 miles/.5 gal) EOC P&G drops to 48.4 mpg (30 miles/.62 gal) NICE-on. That's a 20% penalty for engine-on coasting.
My SE-R idled at .22 gph. NICE-on P&G in my Nissan drops a 60 mpg EOC P&G from 60 mpg down to 44.4 mpg. The penalty for idle coasting is >25% with the Nissan, which has idle consumption similar to your truck.
That's why I can never top low 40 mpg in my wife's AT Hyundai Elantra. It has to have the engine running to lube the AT.
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Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
Last edited by SentraSE-R; 04-10-2011 at 06:17 PM..
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