I had an 89 300TE for a number of years, looking at my records from 94-97 for 50,397 miles I got 17.81 usa miles per usa gallon (mostly city driving). 2002 I got about 19 mpg (mostly highway driving). However I always felt the number this engine produced was low as compared to epa number of 17-21, was very rare to see numbers over or near 20.