Just wondering if the tC gets better with higher miles in terms of performance and gas mileage. Ofcoarse, they would have to be bone stock.

 

It depends on how you drive it. ECU controls in automatics usually adjusts to the owners driving habits. I don't have alot of miles on my car to tell if it drives better but I don't think it will improve in performance unless you modify your engine. And driving a manual gives you more control of the gas mileage than an automatic if you know the points when to shift.

 

Automatic has the smart tranny. I don't know what values it adjusts, but there has been threads on here of people buying used tCs and complaining about shift points, jerky ride, etc.

 

I think it adjusts the main line pressure value for smoother shift engagement.

 

automatic has an ECT
Electronically Controlled Transmission

The car won't shift into overdrive until its been warmed up
AND
It controls its shifts based on throttle position. If put your foot down, it'll stay in gear longer and vice versa.