shikataganai, good work! A couple of things don't jive though. First, you're mixing engines in almost all vehicles (i.e. Mustang engine switched from 5.0L to 4.6L in 1995, Camry motor switched from 2.0L to 2.2L to 2.4L to 2.5L in 2010). Also, for even more interesting data, compare the ratings on the automatics. Almost 100% across the board the economy has improved, very drastically in some cases.