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Cali, your improvement is real, but your testing is uncontrolled. Variables include fuel formulations, tank fill, gas quality, ambient temperature, dry/wet road conditions, traffic conditions, driver concentration, driver desire to see improvement, tire pressure, and much more. Let's just put up a number like 20 variables in your tank to tank observations.
ABA testing with instrumentation like a Scangauge or Ultragauge can eliminate almost all of those variables. When I did my WAI testing, I drove the same round-trip test loop on the same day with no traffic, using cruise control, using the same tire pressure. Temperatures and wind conditions were the same. Your tank to tank observations let all of those variables fly out (or in) the window.
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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
Last edited by SentraSE-R; 03-11-2011 at 01:31 PM..
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