This has got to be the dumbest thread I have ever seen, there is a reason donut tires tell you not to go over a certain speed, its because they are cheaply made tires made for short distances. Gas mileage is not going to matter to you when your in the hopital for going off the road because your donut tire exploded on the highway and caused injuries to your self and others. Next somebody will be saying to try them in the snow because their skinny and they might work like ice skates
It's funny, because it's true! not so much a skate on ice, but like an ice skate on a snow covered road, cuts through the snow and reaches the clean grippy pavement.