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Daniel, Also remember that your engine's cooling ability depends strongly on rpm. There are lots of variables, but I believe that this can be a good reason to choose a lower gear / higher rpm combination in many situations, since cooling is better. Of course, burning more air & gas creates more heat, and turning at higher rpms makes more frictional heat. Perhaps oil & head temperature sensors are the way to go if you really want to know for sure. I once rode around on a hot day in a friend's beetle with both oil & head temp gauges. The driving was mixed between highway and stop & go. It was fascinating to compare the two gauges under the varying conditions; sometimes both would rise, both would fall, or they might actually move in different directions! It's too long ago now for me to remember what we saw under different conditions. -Greg ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org