[orange4boy]

I've seen different numbers on this vacuum question. Some say 10 some lower like 6 or 7. The best P+G numbers are apparently at 75% throttle which is probably under 3.

I tested this on a couple of tanks. One where I throttled it up below 5 to speed then did steady state and the other where I "cat" footed up to speed at max 9 or 10 and there was only a small advantage to the "cat" footing. This was not a good enough test to see for sure but at least there wasn't a big difference.

Probably somewhere in between is good. I was surprised to see not much difference despite the "No jackrabbit starts" crap. As long as you are not wasting too much momentum, between 10 and 5 seems good.

I like to divide up the driving into

1) Create the kinetic energy efficiently under good BSFC and get up into the high gears fast.

2) Steady state and coast as much as possible.