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A couple of years ago, my SE-R's mileage started going down on long Summer highway trips. Mileage dropped from 38 mpg to 36, same drive, same Summer. Since I hadn't changed anything else, I replaced the plugs. Their gaps were all in the .055 range. After I got the new plugs in, my mileage went back up to 38 mpg on long highway drives.
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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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