Question for Michelin Pilot Sport A/S 3+ users

[Nick M3]

TireRack says that the A/S3+ has relatively good rolling resistance vs. comparable tires. A couple MPG and slower acceleration is either your ass dyno, a change in diameter (if they are meaningfully bigger, you’ll record less distance traveled, and have the car geared up higher), or something coincidentally went wrong on the car.

[equ]

Originally Posted by Nick M3

A couple MPG and slower acceleration is either your ass dyno, a change in diameter (if they are meaningfully bigger, you’ll record less distance traveled, and have the car geared up higher), or something coincidentally went wrong on the car.

This. Either some slight thing, perhaps you had really old tires which made more noise & vibration adding to perception of speed. More likely, if you are observing a definite effect, then something is going wrong. Assuming you got the same size of course.

[3LOU5]

Originally Posted by equ

This. Either some slight thing, perhaps you had really old tires which made more noise & vibration adding to perception of speed. More likely, if you are observing a definite effect, then something is going wrong. Assuming you got the same size of course.

The vibration was caused by the old tires being out-of-balance, because after my new tires were mounted, the vibrations disappeared.

I usually glance at my tach needle when I shift, and it seems that it doesn't climb towards redline as quickly.

Again, I can't figure out what went wrong mechanically because I didn't even mess with the engine.

[3LOU5]

Originally Posted by Nick M3

TireRack says that the A/S3+ has relatively good rolling resistance vs. comparable tires. A couple MPG and slower acceleration is either your ass dyno, a change in diameter (if they are meaningfully bigger, you’ll record less distance traveled, and have the car geared up higher), or something coincidentally went wrong on the car.

The change in diameter is an interesting observation, because I ran those old Yokos until it only had 2/32" of tread left.

My new A/S 3+ came with 10/32" of tread, so you may have a point.

I brought the wheels to Discount Tire to have the tires mounted, so they didn't have a chance to touch my car and do anything wrong.

And if something DID go wrong mechanically, I really wonder what it could be because all I did was jack up the car at all four corners.