What kind of miles per gallon figure do people get from their 101s?  Mine’s a 750, running a DLX, on stock gearing and cruising at 40-45 I’m only getting around 20 to the gallon which is a bit inconvenient on runs.  A friend with a ’25 shortframe 600 gets similar.  I’ve tried leaning out the carb but it’s really as lean as I’d want now, and running pretty much spot-on other than at lower speeds with a trailing throttle when it runs rough.  I’ve read that I should expect around 50-60; is this realistic?  Is there something I have missed with my carb setup? What sort of tank range should I be getting with my bike?

I get 45-50 MPG on ethanol regular on a "correct" 45 CI 101 at 45 MPH.  Yours may be running rich.  Try the adjustment procedure in the riders instruction book for a starting point.  If that doesn't help, then I would look for a float or needle problem

OK, thanks, chaps.  It appears I may have (yet another) problem then! I'm confident my carb is well set up, and am confused as to why my machine runs well without any signs of running rich, or oil dilution - if I'm using so much, where could it be going?  I think Ken may be correct, that it's a transient issue at trailing throttle, perhaps when both idle and high speed jets are working. But I think my most sensible first step would be to reconfirm the consumption figures I did.  It's a good excuse for a nice long ride if nothing else!