You've got to plan out your route, with your range of fuel here in the southwestern / western US .
If you stay off of the interstate highway system, you can find yourself hours between fuel stations .
Last time I was in central New Mexico on US 60 left Socorro, NM going westbound and about an hour later, saw two HD riders on the side of the road, one was out of fuel and the other was on reserve .
Siphoned fuel from my Honda CRX and got both of them filled up .
They were Sportsters with small fuel tanks, not a great choice for long distance riding !!!!!!!