Temperature alone has a noticeable effect on fuel economy during the first few miles driven. It takes me about 4 miles to bring my fe up to 40 mpg in 45 degree weather, 2 miles to do it in 65 degree weather, and <1 mile to do it in 90 degree weather. Coastal California weather is consistently mild, and I can minimize the cold weather hit by avoiding short trips. my mileage logs show little if any seasonal/temperature effects on fe.
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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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