I get from 17 to 19, on 87 Octane(sp), got about 20 once, but don't know what I did right. I have about a 50 mile trip to work, up and down a lot of hills, so very little of what you would cal hiway miles. Everything is pretty stock, except a K&N air filter.
I will agree, who'd put up with such poor milage if it wasn't such a great thing to drive.

17 to 19 mpg, but 100 spm, (smiles per mile), that equals about 19000 smiles per gallon!!!!:bgwg: