Guys, I have said this umpteen times, but Ill say it again on the off chance someone will listen to me this time!
I have had 2 172s, the first one I rejected due to paint imperfections. Anyway I had that car for 3,500 miles, I never thought that the car was fast at all, infact I went completely off the 172 and was going to sell the replacement. The first car just didnt have any pull low down and not much of a change higher up. It was pathetic really!
The second car however is an absolute beast in comparison. This car completely changed my mind about the 172, straight off with practically no miles on it, I could feel the difference. It pulls hard from 2krpm and flies above 4.5krpm. I always use my mates 200+BHP Cupra as a yard stick, I can stay with it til 120MPH, now that car is an animal in a straight line!! Also a 15.08(missing 4th gear) 1/4 mile run, proves it is no slouch!
I do feel sorry for the guys that have slow cars, coz when you get a good one, theyre fantastic cars!
The only thing that I could suggest is to take it along to your dealer and tell them you dont think it is running right. Ask them to upgrade your ECU to the latest version, new versions of the software are given to the dealers quite frequently!