There may not be much.
Figure the 5.0 gets it's 26 mpg with 235 tires. Put the 255's on it and it will probobly lose 1 mpg.
The v6 manual trans is rated at 29 mpg with 225 tires. Put 255's on that and it will probobly lose a point or two, as it has less torque to overcome the heavier wheels and extra rolling resistance of the wider tread. The car only weights 50-100lbs less than the 5.0.
I'm thinking real world mileage between a v6 and 5.0 stang with nice rims and tires is going to be two or three miles per gallon on the highway.
And while both can run crap gas, they both benefit from higher octanes, so call that a wash.
Agree?
Figure the 5.0 gets it's 26 mpg with 235 tires. Put the 255's on it and it will probobly lose 1 mpg.
The v6 manual trans is rated at 29 mpg with 225 tires. Put 255's on that and it will probobly lose a point or two, as it has less torque to overcome the heavier wheels and extra rolling resistance of the wider tread. The car only weights 50-100lbs less than the 5.0.
I'm thinking real world mileage between a v6 and 5.0 stang with nice rims and tires is going to be two or three miles per gallon on the highway.
And while both can run crap gas, they both benefit from higher octanes, so call that a wash.
Agree?