Gas mileage

Given the following pictures:

1) 208,355 miles with a full tank

2) 208,777 miles with a near- empty tank

3) And the 16 gallons required to fill it up

I conclude that my Toyota Camry '96 travels an approximate average of

(208777-208355)/16.001 = 26.373 mpg on mostly highways.

Not terrific, but not terrible :)