Condensation under valve covers --E85?

Bad Sport said

Both of these are important for street use.

If you are only running it for short periods, the engine doesn't really get warm enough to burn off the condensation.

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Not running to temp is also hard on exhaust systems because it creates a lot of condensation inside the pipes and mufflers.
If that condensation doesn't get burned off it lays in the exhaust and rots it.

Just adding some info Bruce, as I know that you know this already. :D