I just got back from driving my 82' 4 speed 240d for a 30 mile drive at 4500' Elevation.

I had er up to 65mph at one point.. she has a sweet spot at 63mph and she just hums along.

I notice my temps don't get up very high and maybe I'll experience less economy if not dialed in. I am running about 60c on the gauge. Not sure what that is in farenheight.
Anyway.. this is a car from Vegas and now resides in Utah. What is optimum temp?

thanks guys