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i just logged my second tank on my truck with the aero cap. the first 120 miles of the tank were in 10 degree weather at night that i was averaging 27.9 mpg and the rest of the tank was the return 200 mile trip that started with the first 60 or so miles using the lights and the air temp when i started was 20 degrees and it was about 30 degrees when i finished the trip. the tank average was 30.09 mpg. i think that if i got a full tank in with temps above 30 degrees i would get somewhere in the 32mpg range.
its funny but it turns out that my first tank that i logged is the same exact miles and fuel used without the aero cap but the weather was allot warmer. it seems to me that ever 10 degrees is about 1 mpg.
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