So I have a 1993 Toyota Camry LE 2.2L. I mostly do city driving except for some days. In the city I will average 14.5 MPG. So today I wanted to see If i got crappy MPG on the highway, I drove 150 miles and ended up getting 27.1 MPG. I have a feeling that the fuel filter is playing a role in my city MPG, but why isnt it making my highway mpg go down to craptastic levels?