Wondering why people complain that Yaris' cant get good mileage?!

[CtrlAltDefeat]

Originally Posted by brg88tx

cold air kills mpg.

Cold air does not kill mpg... moist air does. Cold air is more dense than hot air (the reason behind inter-coolers) and fuel burns more efficiently. Cold dry air gives mpg a noticeable boost, the car is even a bit more powerful with cold, dry air.

[tire]

Originally Posted by CtrlAltDefeat

Cold air does not kill mpg... moist air does. Cold air is more dense than hot air (the reason behind inter-coolers) and fuel burns more efficiently. Cold dry air gives mpg a noticeable boost, the car is even a bit more powerful with cold, dry air.

I can't count how many times I've read things like this (I'm sorry to say this but this is incorrect). It's quite simple, "colder", denser air is indeed pulled through the MAF or whatever air intake sensors are called on Toyotas. That sensor, um, senses more air and adds additional fuel to the mixture. At very best the mpg before and after will be negligible, at worst you WILL lose some fuel economy. I'm not sure how this myth permeates every automotive forum. It takes money to make money in this case, and I sure wish it didn't. :-)

Austin