Not trying to get into the middle but I just last saturday bought a bone stock 89 LX 5 speed. I had to drive it around 4 hours to get back to where I am staying now. All interstate driving but over a semi major mountain range climbing from around 3500ft elevation to 6000ft elevation then back down to 4000ft elevation. I was not to easy on the car, running it up to over 100mph a few times, dropping a gear and doing 65mph to 90mph pulls more than a few times and I ended up averageing 29mpg. This is a 20 year old bone stock car right down to the air box and exhaust.