We are downsizing to a Chausson 510 delivery end of April, from a Dethleffs Esprit A Class. The Chausson only has room for 1 gas bottle, and we are told the heating can run off the diesel. The query we have is that diesel is so expensive in comparison to heating fuel. Would it be possible just to have a separate tank for this, if not has any one else experience of running heating on diesel costs etc. Thanks.