Burlmart, I have the same engine as you and I am averaging around 12 all of the time. That's driving with full tanks and keeping it to around 55-60 MPH.
1st question to you is ,even though the system has an engine sensor to let you know when to change the oil,why would you wait that long. Personally I would never wait until the system told me to change it. I think my manual says somewhere around 10,000 miles the light will come on, and maybe longer if you are using synthetic oil. I use Mobil 1 synthetic and I change mine at 5-6,000 miles. It may be a little over kill but believe me its not well worth the cost.
I guess it up to the individual and if they plan on keeping their RV for a long haul. The only time I would run a conventional oil in an engine for that long would be in a rental, lease or an RV that I was only going to keep for 2 or 3 years. I plan on keeping mine for a long time so I give it the best care. Just remember, if you do keep your RV somewhere down the line you will be paying for those lack of oil changes. Remember when the Auto industry came out with the ball joints that didn't have the grease fittings and were suppose to be lifetime. Ya right!! Whose benefit was that for? Not yours. Same with engine oil changes, they would love to sell you a new engine . That's only my 2 cents worth, I guess I'm old school, running conventional oil I would never go more than 2,500-3,000 miles, but that's me. good luck with yours. Almost forgot your question, I don't know how to reset it because my light has never has a chance to go off yet.