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It's hard to diagnose what's happening long distance. Photos of your displayed gauges might help. Are you resetting your trip settings on every drive? The instant mpg display and trip mpg display are the same for the first 45 seconds to 1 minute of the trip, after which the trip mpg switches to a true average.
UG distance allows you to calibrate its distance to correct for different tire diameters. Whether it uses the same signal as the odometer or not, it has to be fine tuned.
Your current UG mpg estimates are initially optimistic, because they're uncalibrated. When you fill your tank the first time, it's a good idea to adjust to half the calibration called for, so you don't overcorrect.
UG won't change your driving habits. You have to do that. My car doesn't see the north side of 3000 rpm, and it turns 3000 rpm to go 60 mph.
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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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