You're lucky to get. 17mpg at 80. I got 18mpg with my 32s at 65. That's my limit, I get 22 right now at 65 you're just a speed demon with an underpowered engine. Doing 75+ there's some hills I have to downshift for but at 65 it will hold up against anything my drive threw at it, albeit close some times.
98 XJ Sport | i6 | AW4 | 231 | Stone White | Agate Leather
SOLD 01 WJ Ltd | i6 | QT2 | Moog HD steering | Tow Package | Boston Acoustics Audio | RB1 | Lou's Catback | Stone White |