Choose the fuel graph you like, select a data point (bullet) on your selected graph and check the table right below the data point... and there you are.
Also note that the ISA graph means 15C and MSL. Considering both parameters explains why there is no bother above 3500 ft anyway.
6000 revs are out of bounds, 5800 are OK for max 5 minutes. If you notice signs of detonation reduce revs and take it a little easier. Not knowing the type of plane you ride I would guess one usually gets a decent climb at 5200/5300, too. In that respect, worry less and fly more! By the way, it's called air time not miles flown.
;-)