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It's probably residual voltage bleeding through, specific to your car. Some, for instance, don't close their TPS completely. My wife's Hyundai Elantra keeps something on with the ignition on/engine off, so its avg mpg (as indicated by Scangauge) keeps on declining with ignition on/engine off.
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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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