Bill
I know they do have a reputation for eating the rear engine in a hurry for lack of proper cooling. I also know there are a ton of STC's available, including several to improve the cooling in the rear.
They are incredibly loud inside - I have personal experience there.
I would venture that 20 GPH is right on the money.
But, for a twin, they are available cheap and they have a dedicated following and a lot of after market stuff available.
If you are looking for speed, they ain't it, nor do they carry a ton of stuff. But they'll fly on one engine if they aren't heavy and its not that hot, from what I hear.
There's a fair amount of information available on them online, too....
