all cars regardless of original cost start to "no longer be new" around 80k miles.. (some sooner). By 120k they tend to need a few parts replaced, like a ball joint or tie rod end, maybe a bushing. That is all cars, even $50k ones. the aveo specifically around 120k miles, i would plan on replacing the strut mounts and struts, probably about $300 in parts, you can check the bushings etc at the same time. If you cannot do the struts themselves, i would at least do the front strut mounts..

You've already give the engine a tuneup, however your miss could still be the coil pack, if it is cracked on a particular post, and not the side of the coil. Personally getting rid of the platinum plugs will help you, by design. But this is still debatable on the forums as far as effectiveness to inappropriateness (read about platinum plugs and waste spark ignition compatibility problems). I am not sure about the iridiums, i have never run them and would personally stick to the coppers, even if you replace them twice as often they are typically half the cost. Most important thing to check with age is the engine mounts, check all three of them, and cycle gears while hold the brake to see engine movement.

There are a few aveos approaching 200k on these boards. So they can go the distance, however, since it is an economically built car the "cheaper" components will start to rattle, unlike high line cars like mercedes, bmw etc the dash bolts dont necessarily have loctite, lock washers, and bushings on them to keep the dash tight.. same goes with the rest of the interior.

as far as life "expectancy". based on average cost of buying a car etc.. typical cost of ownership and such.. i think you aveo is already done its job.. but life expectancy is 13 years and 145k miles regardless of make or model..

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