I have never heard that warmer weather can improve mileage. That is counter intuitive. Cold weather air is normally more dense that hot air, meaning more specific energy per cubic foot of air. Plus, efficiencies improve as the difference between intake air temp and exhaust air temp increase. Maybe the thinner air when the air is warm has less aerodynamic drag..?? Where did you hear that warmer weather can improve mileage?
By the way... my IS350 is regularly getting about 23 mpg per tank with mixed city driving. Very consistent for the past 2 years. I've never seen it go above 27 for an extended highway trip.
Oh, this could blow up into another huge debate........LOL!!
The temputure of the air has no bearing on fuel mileage in a modern engine as the ECU will adjust to maintain the same ratios, no matter the air temp. The only thing that may change is the amount of power the motor will produce, but even then we are talking a very small number.
Baloney! Don't you unsderstand how a car works? Besides, air doesn't drive the car, the rear tires do. :huh: