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Generally speaking, the lower your average speed, the better your mpg, all other things equal. If your city streets route doesn't involve too many starts and stops, you may beat your highway route for mpg avg. The easiest way to find out is use your iFCD or Scangauge to compare the routes.
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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
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