I have been driving the sierra from 1993. first the naturally aspirated engine till 1998 and then the turbo version. though the turbo version is a good 1 las more than the noprmal version it is worth it.first thing is the additionasl power. it is 90 bhp and you feel the difference in pick up the moment the turbo kicks in at 2000 rpm.then the vaerage is somewhat better. 8 in city cycle and 11 in highway running.drawbacks are the lack of two doors.the passesngers in the rear seat are as good as locked in and have to jump over the folded fron seat. but the vehicle is great if basically one or two people will ride majoritynof the time. maintenance is not a problem as parts are available everywhere and it is quite cheap compared to other new cars.