The major fuel MPG change is it takes 5-7 miles of driving to get the car up to operating temp and then it shifts into OD/lock converter.
Also all the oils are a lot stiffer in the cold than summer.
The tires have a higher rolling resistance when cold vs warm.
IT all adds up to lower MPG.
I had 3 HD2500 Chevy and GMC P/U trucks w/ 6L motor.
Summer 13-14 mpg and winter 11-12 mpg, I commuted the same for years and the knew the miles/tank very well.
Yell'r 04 Lux w/ air, sunroof,F&R brush bars
Traded 03 White Lux
03 GMC D/A CC SLT LB soon to be 04
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07 White H3 Adventure w/ some black stuff
04.5 GMC D/A CC SLT LB EFI LIVE tuned
98 ZR-2 Blazer
Ex H2&3 owner
My hiking boots and canoe paddle have more miles than most 'offroad' vehicles, over 350 in last year.
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