the autos do not run 115mph stock. your talking about a pass at a track that is known for having a faulty timing system. My car stock in the 90+ heat with 100 miles on it went 13.25 @ 107.5 mph.
so with 100 or so more miles on it, with a gear, tune and tires it picked up .9 in the 1/4. had i not deep staged the last pass and pushed through the beam, it would have been a 12.2 @ 113, , car picked up 6mph and about a full second off it's e.t.
as far as tires helping. my tires weren't spinning at all when stock. it's not a stick car that is going to pick up as much from high launches. the car is pulling high 1.8 60's.
So, on my car, in my heat, the car picked up about a full second from a tune, gear and tires. not too shabby. not to mention, the tire is a 28" which is overkill and pulls back away from the gear, but i'm planning on more power and had them anyway.
you can't take one car at a track with a faulty time system, and call that the norm for mph