Mark Rinker
11-14-2008, 18:26
At 120K miles, the factory Michelins that came on the C4500 were shot. Ordered up new Michelins for the rear, and Bridgestones for the steers. Went up two sizes to a 245/70/19.5 on the factory Alcoas.
Tire diameter is 6% larger, causing speedometer to read 60mph when actual speed is 63. (I plan to adjust this when my Predator programmer with the C4500 tune arrives.) The loaded acceleration from a dead stop is a bit more sluggish than usual, but nothing noticeable from there on up to cruising speed.
Cruise RPMs are ~1900 at 58 mph, not a bad speed in the right lane when you are 12' wide towing 36' of boat!
So far, it looks like mileage is getting a .5 -.7 mpg boost. Need more miles and boats to have a meaningful average, but its enough of an increase to be noticeable on this first trip out.
Tire diameter is 6% larger, causing speedometer to read 60mph when actual speed is 63. (I plan to adjust this when my Predator programmer with the C4500 tune arrives.) The loaded acceleration from a dead stop is a bit more sluggish than usual, but nothing noticeable from there on up to cruising speed.
Cruise RPMs are ~1900 at 58 mph, not a bad speed in the right lane when you are 12' wide towing 36' of boat!
So far, it looks like mileage is getting a .5 -.7 mpg boost. Need more miles and boats to have a meaningful average, but its enough of an increase to be noticeable on this first trip out.