Dieter - By coincidence, Randy Harris just brought his '62 Imp to Bob's Big Boy last night with his new Firestone 721 tires and raved about the driving improvement over his old Remington's. Many other IML folks alos endorse these tires. You can expect a slight mileage improvement, but something else needs attention if you are only getting 8 mpg! Bob > Just curious ---- A friend of mine owns a 35 ft motorhome with a V 10 triton > engine and weights at least 18000 LBS makes 8 miles per gallon. Me with my > 55- 331 cid Newport 2- 4 barrel carburetor weighing around 5000 LBS making 8 > mpg also ---if I am on a turnpike. I am sure some of you with the 413 and 440 > engines with a single 4 barrel carb. are experiencing the same thirsty > powerplants. Will new steelbelt tires improve gas mileage, still have the > old H 78x 15 4 ply Remington Cushion Air tires. Any thoughts on this . I > would appreciate very much.. Sincerely Dieter in Pa 55 Newport >