Well, I put the original parameters on the lean cruise tune and the mileage went up. Then I modified the lean cruise numbers slightly higher and I lost even more mileage. It seems leaner makes mileage worse on these engines. Maybe if I had wideband hooked up I could hone it in. I have 2 lc1 wb kits I was going to put on my s10 but it seems one will be enough since I won't be able to squeeze too much out of it based on these results.