Last fillup I reset the trip meter and yesterday I filled up and the trip meter said 61.4 miles and I put in 3.038 gallons of 87 gas. That comes to 20 mpg. The tires are at 30psi, oil changed recently, clean air filter, 87 gas from shell and bp oil gas. Its a 2010 with 43k miles on it. I did use the AC a couple days but I still dont know why the mpg is so low. I dont floor it at all. It is an automatic trans and rev it gradually and it shifts at 3000 rpm. Any suggestions?