I'm considering purchasing a G5 Coupe, Between the year of 2008-2009 I am looking at one's that are pretty much loaded aside from the GT, witch i am not after for reasons. I just have a few Questions i want to ask for those who are ok with answering quickly, or redirecting me to the answers. These are just couple things i wanna no about this Particular Car and It's Cobalt Twin. Question #1. Do the Ecotec Engine's Use Timing Belt's or Timing Chains. I'm aware the engine's have changed a bit through the years, I am most likely to wind up with the 2.2L placed in the 08 and 09, SO i am only asking about the 2.2, not the 2.4L or the turbo/super. Question #2 What kind of Gas mileage should i expect From an Automatic 2.2L 4cyl if driven Lightly everyday to and from work and the occassional Elsewhere around town. I Understand the Factorys 100% Just wanna here from Other drivers, And Also how is it on the highway. Question #4 (Although this one doesn't matter much to me) Is the Pioneer Audio system Much better then stock. All answers appreciated thanks guys.