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Rule of thumb (based on my own data and other Ecomodders' data) is 1% FE drop for every 2 deg F temperature drop. So 4.4% lower and 10 deg F cooler is very reasonable.
Also, don't discount fill variations. Getting to within +/- 5% on just fill variation is tricky.
I personally don't put much stock in fuel brands, but if you want to simultaneously compare cost & FE, the best way to do it is $/mile.
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Diesel Dave
My version of energy storage is called "momentum".
My version of regenerative braking is called "bump starting".
1 Year Avg (Every Mile Traveled) = 47.8 mpg
BEST TANK: 2,009.6 mi on 35 gal (57.42 mpg): http://ecomodder.com/forum/showthrea...5-a-26259.html
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