Motorhome stuff

Back from flying now.  Talked to a friend of ours, Paul, that has a similar coach, and we've been discussing changing out air filter and muffler for much increased fuel mileage.  Probably going to change the air cleaner right away and the exhaust soon.  Seems worth it to increase the mileage as mush as 40%.  Sounds like snake oil claims almost!  Also, it turns out we need new chassis batteries, and now find out Monaco most likely used the wrong ones from the start.  Boy, money, money, money......