The AVG gauge resets to zero after the ignition is off for a set period of time - either 90 seconds or 3 minutes. That's because AVG is your current trip mpg, and the developers of the SG set it up to reset your trip mpg, distance, and fuel consumed after an engine shutdown.
The SG still maintains day and tank parameters in memory, but current trip parameters disappear. The SG's competition, the Ultra-gauge, takes the opposite tack, and maintains trip parameters until the user resets the trip.
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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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