This was answered on an episode of Mythbusters, you get better gas mileage with the AC on.
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Yes.
I have an AEM CAI on my 07 Civic LX. Love it! I'm getting an additional.....3-5 mpg?
I have a 2003 Envoy. I get better gas mileage by using mobile 1 0w-40 oil. Use any oil approved to be a substitute for BMW longlife. I drive 32miles a day, 24 miles highway and 6 city. In bumper-to-bumper about 1/2 the time. I get 17mpg. When I drive straight highway I get 22.7-23mpg. I never get less than 20mpg on the highway.
Yes, you can . I have had those and 215/65 R 15 on my 97 Taurus wagon.
14mpg