Don't believe the Scangauge until you've calibrated it against actual fuel used. I owned a MT Sentra SE-R with the same QR25DE engine that's in your Altima. I'm a serious hypermiler, but was only able to average 38 mpg over 20,000 miles with the lighter Sentra and a manual transmission that allows engine-off coasting. I doubt very much that an automatic Altima can average much better than the low 30 mpg range in mixed driving, or mid-30s on highway trips, unless you have exceptional conditions.
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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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