Glad you guys liked the read. This is the kind of thing I think about when it's too cold to racing

The whole point I'm trying to make is NOT there there is no difference between engines in mileage. The point is that it is my belief that today's .21's (.21's not .12's) with the pipe and fuel combos run by most pros are actually getting better MILEAGE than we used to get. It's the increased speeds of the cars that has reduced our runtimes.

.12's are a bit different story. The early engines were pretty primitive compared to today's. Plus the old exhaust height restriction means that today's engines are pretty different. Add in the fact that cars and tracks have gotten much faster and the drop in runtime has been even quicker. I used to go 8 minutes with my first TC and a side exhaust Nova .12.