Look at my sig and avatar for what I drive.jason k wrote:not in an Aircooled, you must rev em as labouring em in too high a gear on hills creates a heatbuild up and heat is no good for an Aircooled motor. dont be afraid to rev em. more revs= more cooling air.

Guess you missed the bit about the bored and stroked 2.0 type1 built from a 1.6 for over 80k in a hightop camper?
Sorry, but I speak with over 20 years of experience with AC engines.. and many others.. in extreme conditions.
2000rpm moves less air, but engine also generates much less heat then 4000rpm... fan doesn't need to move as much air because there isn't as much heat. I'm not suggesting putting your foot through the floor at 2000rpm on a long hill. I'm saying in slow traffic conditions, there is no need to rev engine... it only burns fuel. A properly tuned engine with properly maintained stock cooling system can idle for hours without overheating.