poor MPG after tune up

[christopher8911]

Finished installing my digital dic and my mpg in town is 13.4, open road is 18.8. How far off is that from normal for a pretty much stock car?

[Fivefingerdeathpunch]

i get 18-19 city, which really only the 3 mile drive to work and the 3 miles back home. On the open road like a county road or the freeway I can get 28-32 depending on speed.