My motorhome 1987 E350 Class C 26ft. gets 11-12mpg with the right conditions, 100% highway driving, cruise control @ 60mph.

It's got a complete fresh fuel system about 40-50k ago and timed. Made a huge difference in power and mpg!


With 175k on yours, i'm pretty sure it's still got it's original injectors, IP etc. It be time for some new ones!