Yes, I kept pretty close track for a while. After I blew the headgaskets and it was in a good state of tune it ran really well. Even with crappy worn out ignition components and old o2 sensors on 214,000 miles I still get 26-27 on the highway. How do I do it? I don't know, nothing special, I keep it around 10 over and I don't jump all over it every chance I get. Actaully, I get the best and most consistent mileage on my SC's. My '95 regularly pulls down low 30's. Again this is on 100% highway driving.