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It's better to think of it in a real world drive. If you do a 10 mile drive averaging 40 mpg for 9 of those 10 miles, and incorporate that 1 mile downhill, it looks like this:
EOC
9 miles @ 40 mpg.
.025 gal/mile times 9 = .225 gal consumed for 9 miles
.225 gallons consumed for 10 miles = 44.44 mpg
NICE-on
9 miles @ 40 mpg.
.025 gal/mile times 9 = .225 gal consumed for 9 miles
.25 GPH consumed for 1/60 of an hour = .25/60 = .004167 gal.
.229167 gallons consumed for 10 miles = 43.64 mpg
At a more realistic 30 mph, the NICE-on idle usage doubles because the glide takes twice as long, and the car uses .23333 gallons for 10 miles = 42.86
__________________
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
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