I do have big tires so it is harder for me to accelerate and zip by a big truck that's going 80 plus (why do trucks drive so fast), so I often slow down so I can go behind the truck. It's just when I try to slow down, the truck slows down to like 60... so I have to actually brake to slow my speed and then I go behind the truck, and darn... he drives so slow... so I try to pass him and the same thing happens, he speeds up to 80 plus... where I don't want to risk passing, so I slow down, he slows down... I move back behind the truck and I'm back to like 60 mph...