The vast majority of MB suv for sale here in Manitoba Canada 90% are diesel. I've never owned one, but have heard they can be hard on fuel and have poor heat for short trip driving, which I do a lot of. How much truth to this? Judging from how many 350D I see compared to gas versions, I'm thinking that is why! I do recall back the 90's that at stoplights the heat would drop right off.