2610 has to be a turbo Twin Comanche. A non-turbo would be more like 2450 to 2500. Gross with tips is 3725 IF you have at least 125 pounds fuel in the tips. Otherwise gross is 3600. There are some Robertsons with gross of 3800.
A Twin Comanche is a great airplane IF you don't get into icing. With only 160hp per side, it isn't going to handle ice very well. It will do 165k easily on 16 US gallons/hour, and 155k on 14.5, and that is total, both engines.
A non-Trubo, 5:15 total fuel at 16gph.
And no, it doesn't cost twice as much as a single to run, the reason is the systems are so much simpler than most twins.
If you want to carry a big load and deal with some ice, buy an aztec, they may be ugly, and they burn a lot of fuel, but they will fly through a lot of messy weather.