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Sounds like a phenomenon called Super Atkinson Highway Mode. I've searched in vain for SAHM in my cars, but can't hold it very long. I think it's found/held easiest by holding the TPS at a specific value over idle position (i.e., 8 over 12 TPS idle, or 20 TPS), or keeping IGN advance high (>40). Google SAHM Atkinson.
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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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