we have a small block mule engine I teach the students how to tune stuff on the dyno. We have a decent carb and single plane intake on gas, a flying toilet on E-85, and a port electronic fuel set injection set up. The engine makes 15 HP more on the E-85 set up on gas, and 5 HP more on the EFI set up on gas, compared to a Holley and single plane manifold. That's benn tuning on it for several years. Back in the day I did not like alcohol carbs and injectors for bracket racing because of sliming the oil, cylinder wear, and having to drain the system to prevent moisture contamination. Today the newer alcohol carbs and injectors are much better and the cylinder wear is improved, and they do not slime the oil nearly as bad. Most hard core bracket guys I talk to love the consistency of alcohol as a fuel. But since I race NSS, I have to stick to gas as a fuel.