Just depends on several factors: Do you live in town so all your drives are fairly short? Is your town small so it's mostly 2 lane roads, or is it large with mostly 4-6 lane interstate type highways that you must drive on? I ran 4.88's with a fairly low-profile 15" tire as recently as 3 years ago. With a 383 and a loose 10" converter. When I was in town, no problem. We have no in-town speed limits over 45mph, so that was great and it was fun. HOWEVER, the problem was I live outside of town about 12 miles, and had to drive in everyday to work/shop/eatout etc... Like everyone says, about 40-45 mph is all you want to run for very long and I ALLWAYS had traffic backed up behind me. It did get OLD. But if I lived in town, I would keep them.