Don't know the size of the 1800 tank. What is that in MPG? If you had Roadsmith's aux fuel tank on your ride that would be really bad mileage.:eek:
We have a GL1500, 2 up on the normal roads in the Ozarks, between 45 and 60mph, we get right around 35 MPG. The low fuel light comes on at about 160 miles, average 15 more miles until I get gas and I still have almost a gallon left in the (6.3 gallon) tank. Hook up the loaded Bunkhouse and gear for a trip, hit the freeway at 70 - 75mph and it's down to about 27 or 28, or about 150 miles until the "1 gallon left" light comes on. On the 1500 gas mileage nosedives above 3000 RPM. (about 65mph on our trike)