Gas mileage does matter if you're getting terrible mileage that's a sign of a bad tune, bad TPS or something else.
Is the bike factory original or modified?
2015 Cross Country (bought new 7/11/15)
2015 Suzuki V-Strom DL650 (bought new 4/26/17)
2006 Triumph Rocket III Classic
1/4 turn throttle ring
VM-1 DR cams
Timing wheel +4
Lloydz high-flow air cleaner
Bassani baffled OEM mufflers
PC-V 118hp 116tq
If it's not broke, make it better