4 cars in the stable, 3 have deadhead and 1 has a return. The 4th had a deadhead system for years but I switched it to a return style last year. Cars run 10.50-11.70s. The reason I switched the one to a return style is to try and see if it would work better with pump gas. 2 cars we run AV gas and 2 we run a mixture of pump gas/race gas. We've had issues with pump gas boiling in carb on a hot day. Since I switched the one car to a return style I ran straight pump gas last year and didn't have any issues with the pump gas boiling. I will eventually be switching the 2nd car over to a return style at some point so we no longer have to mix fuel.