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There's a thread about max. sidewall pressure, and how the different passenger car tire mfrs interpret the same federal standard. Three of them, including Michelin, decided to mark their tires 44 psi max. The others interpreted the federal standard to mean 51 psi max, and they mark their tires for 51 psi. IMO, you should have no problems doing your tire tests at 51 psi.
You're probably correct that you're approaching your maximum potential with your AT LX. But since we're both in the Bay Area, it might help if we meet & compare driving techniques along a portion of your commute - e.g. a 10 or 20 mile stretch - some weekend.
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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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