running on 205x17x50 in the summer and original toyos in the winter- have two sets of wheels. Summer fuel 35 avg. Winter 33 avg. At some point it did drop to 29 about two years ago- dealer put in shitty oil. went back and made them to change engine oil back to super synthetic- it went back to 33/35 mpg. Clean your air filter too. Tires have very little impact on mpg for this car. I have manual and driving it somewhat aggressively.