We had a a 32' Georgetown (2002) with the V-10 and the older 4-speed auto trans. Our typical load was me, DW and two Labradors. Our trips were rarely over two weeks away from home and all in WA and OR.
It was a "one-owner from new" when we bought in 2010, with just under 12,000 miles on the clock. We put another 6000 miles on it and averaged just under 8 mpg, based on gas receipts and odometer readings. When we realised we were dipping into our IRA to pay for the hobby, we decided to quit after 3 seasons.
Frank Damp, DW - Eileen, pet - female Labrador (10 yrs old), location Anacortes, WA, retired RVers (since Dec 2014)