I am probably stupid and should know the answer to this question but I will ask it anyway. Does extremely cold temps effect gas milage. Driving home tonight and temps are hovering around 15 degrees, going 65 mph and was getting about 19 mpg.

 

Are you blasting the heater? Running the heat will do it.

 

See dumb question on my part, should have known that one. Yea had the heat on 75 and pumped up. I will watch tomorrow and see what happens but I bet that was it. Thanks Cary12.

 

u kno i think the cold weather would effect milage casue
colder air means denser air so to compinsate for this
you must use more fuel so u dont run lean
thats my theory

 

I've been keeping mine low and at about 67 with the seat warmers on. Let me know how it worked tomorrow. It's going to be pretty freaking cold.

 

Will do. Lets just hope we get our snow......

 

Yeah I agree with Panda some. I think you are supposed to get better fuel mileage in warmer weather. I always thought it related to expansion and vapor pressure and all of gasoline. Pandas theory makes better sense for the engine end. So combine the two and run some thermodynamic calcs and get back to us.

 

i would say its more the cold then runnin the heat ....

 

Two things actually(although one is a rumor) -
Rumor is Winter grade fuel (at least in most parts of the country) is a different mix than summer to combat pollution and for some reason this fuel mix gives less MPG than typical.

Fact - as stated above - cold air = denser air charge = more air = more fuel for constant A/F ratio = more power

 

hmmmm.... clever. never thought of this but it is defanetley true..