Man, that is terrible for a 110. Don't know about V-Rods. I whack the throttle pretty consistently and have always had 41 mpg on the 110. Maybe 40 every once in a while. The 117 is at 40 mpg every time I check, which is almost every time I get gas. Maybe a dyno tune would help.
My 15 SERGU gets 42 mpg on interstate cruise set at 3000 rpm, run much over 80mph or a head wind it drops, it gets a little better running all back roads at 60~65mph close to 44mpg. Bike only has a DX head pipe and Fullsac cores with a TTS and Dyno tune by Doc.
My built SERK gets 46 mpg on the interstate at 3000 RPM. Back roads I have seen right at 50 mpg. As you can see it gets much better mph with the head work, 10.8 to 1 compression, 55mm Throttle body, 5.3 injectors and the Fullsac DX head pipe and 2.25 Fullsac cores, TTS and a Dyno tune by Doc. Before the build mpg was like the SERGU above.