Originally Posted by matrix02

Recently I have been experiencing around 25 MPG in an A/T Sport 2008. I used to get around 28-29MPG. I still drive the same semi aggressive. I changed out the air filter hoping that was the problem since it was dirty, but that did not solve it. It is however getting hotter here in Houston, TX...some days were triple digits.

Anyone know if this would be considered normal to lose 3-4 MPG due to increase use of A/C and it being hotter outside?

Originally Posted by mahout

Many short trips in hot weather will cause the A/C to work hard and thus mpg will deteriorate just as you see. Are you on full recirculation? Failure to do that also adds to A/C load on the engine.

Originally Posted by matrix02

right now im studying for grad school entrance exam so whole week..im leaving home early in the morning and leaving the library late at night around 9pm. im not driving in the sun at all so it is bearable. but this is just to see my theoretical mpg in ideal conditions. car is doing over 90% highway during this test. but in retrospect..people are getting an average of 31-32mpg in mixed conditions with this car. either majority are hypermilling or there is some truth to this. im not really asking to be above average or even average due to our climate. but when mpg starts to shoot down to 23mpg it just doesn't sound justifable. i know someone with an 01 civic that commutes to medical center without taking highway and is getting high 20s mpg.