We just sold our C in August due to paying for daughters college vs. loans. Also, we want a different layout for the 2 of us vs. 4 people.
Point is, ours sold within a few weeks on RV trader. Prices listed were HIGH. I undercut those prices by $8 to $12k. Don't think we left money on the table...we didn't. Today, those same comparibles are still for sale and have lowered prices.
Bottom line for us was that what we sold if for was still a GOOD price. A few key ingredients to selling are excellent pictures and write up. Not just specs, but tell them what fun you had, experiences you had. Have a good price. If you model is selling for X price, can you undercut it by listing it at a few hundred or a thousand less? Again, that price is up to you and is subjective. At the end of the day it's only worth what someone will pay you.
And I would not worry about the gas prices...ours sold fairly quickly while gas was still over $5 a gallon. And I made sure the 55 gallon tank was filled as a "bonus"...it helped.
