Browsing through the EPA's site and their testing methods I noticed that they keep their lab VERY warm when testing FE. 68-86?F (20-30?C) making an average temp of 77?F/25?C (0?C is 32?F. Add or subtract 9?F for every 5?C raised or lowered).
Hmmm...since I bought the Metro in Sept. 2005 I'm certain that we've only had 10 to 15 days of weather over 20?C in my area. I have actually been recording temperature over the last few tanks and the average last fill was 11.2885?C.
I've noticed that Motor Trend, Hot Rod, and most auto mags will often correct 1/4 mile times to compensate for altitude, temperature, and such, so why shouldn't we at various times of the year...especially in -20?C weather when I struggle to get 35 mpg out of the Metro...
. Here's what I came up with:
Based on some collected data and a guesstimate my Metro gains/loses 1% fuel efficiency for every 1?C rise/fall. My last average recorded temperature was 11.2885?C and my last three-tank average was 43.041 mpg. Using the EPA lab's average temperature, my temperature correction is:
25 - 11.2885 = 13.7115 (this becomes the percentage rise in FE)
43.041 x 13.7115% = 5.9016 mpg gain
43.041 + 5.9016 = 48.9426 mpg
95metro 
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