My yearly test is coming up on Friday.  I have been working hard to figure out how much fuel I can throw at the truck without causing visible smoke.     I am allowed %20 opacity on lug down tests at 40, 50, 60 mph.      This will be the first year I have run the Quadzilla during the test.  I have my tune nailed down pretty well.  starting % of 76 seems to be where there is next to 0 visible smoke in any situtation.  Last year with the smarty on %50 power mode I ended up at %7