1992 Toyota Celica GT MPG...

...for the month of July 2005:

01JUL2005 : 169008.4mi : 12.908gal : $2.199/gal : mpg = 26.00
14JUL2005 : 169302.3mi : 12.675gal : $2.269/gal : mpg = 23.19
29JUL2005 : 169597.5mi : 13.061gal : $2.159/gal : mpg = 22.60

This data is raw.