we have had sevaral 5.3L Chevy's and all ofem have been a great truck the one had 150K miles but we traded that one for a duramax and then we still have a 03 and it has 110K miles and the only problems so far we inflicted upon the poor thing by teenage(me and my brothers learnd how to drive in this one)drivers(it's dads truck)
gets 20MPG on the open road but it aveages around 16MPG all round