ah, yea ive noticed a pretty large mileage drop too, i live in northern illinois, right by iowa actually. i forgot to reset my odometer last fillup but if i recall right i drove like 10-15 miles b4 i realized and reset it, but according to my calculations, i got around 27-30mpg... thats only from filling up 3 gallons but hell... im hoping i just got a bad batch of gas or something or that i messed up my calculations.. hell >.< lol