Yea, its around $3.00 here at a truck stop. You are right about the SRW trucks. I have 2 Ford Diesels that are SRW. They are very tough.
My 2004 F-250 has a GVWR of 10,000#-the truck and me at 7,500# leaves 2,500#.
My 2006 F-350 has a GVWR of 11,500#- the truck and me at 7,600# leaves 3,900#.
That is the reason I tell everyone not t bother with the F-250. As you can see the same truck in a F-350 will carry another 1,400# in my case and I can tell no difference in the ride. I have owned 2 3/4 ton trucks(Dodge and Ford) and 3 1 tons(2 Fords and one GM) and can not really tell any difference in the ride of any of them. The current truck I have, the 2006 F-350, will handle the weight better than any of the past trucks. SRW 1 tons are the best keep secret out there. I drove a dully for a while and will never do that again unless all I was doing was transporting down the highway. But not for a driver.
Chris