RV2017, Start with the basics... since it is new to you, have the tech check the systems via a scanner. Depending on the mileage, it may need some normal preventative maintenance and perhaps fluid changes, filters, plugs, wires, coil packs etc.
Having said all that, what you experienced could be "normal" performance. Perhaps influenced by weight, grade and/or altitude.
For reference, we've seen 45mph a few times in our 32' class c pulling a 4000lb toad up some seemingly "gentile" inclines. However, what I sometimes forget to keep in mind is the altitude and duration of these grades... yep, the longer the pull, the more difficult it is to maintain a full head of steam. Momentem only gets you so far! LOL
Good luck,
Gary
