Autotrail 696G 4 berth 2007 advice please

Hi all

I am looking to buy an Autotrail Cheyenne 696g motor home. it is a manual on a 57 plate with just over 10,000 miles. It had the SE pack ie ,cab air con and cruise control and sat tv sytem.

I have read on some forums concerning damp and condensation.If anyone can assit with things to look out for please lt me know. I am buying from a dealer and it will come wiht a full habitaion check and warranty.

 Also would like to know how MPG i can expect. I have been told anythong from 20 to 26 ,27 ?

 We plan to travel local and long distances in the van so i guess economy will differ.So some guidines would be great.Or any advice from members and owners concerning these vans.

Thankyou Andy