...besides, the 749 was really heavy
That's the trouble with the small SBK's, really it's only the crank, cylinders, pistons, heads that are different, at the most.
So it'd be just a teeny bit lighter than a 999.
If you're tracking it, mileage isn't going to be too big an issue.
You're using it much harder than on the street, which is a bit rough.
WTF, just called you...