I wouldn't say VI's are more thirsty than later model evo's, they are actually a bit lighter and run less boost, so I would be surprised if they did. If you want an economical car then don't buy and evo, although they are not much worse than other cars in their class, going average speeds on the hwy my TME uses around 10.5l on average, with a lot of city driving about a litre more. On track I have had as bad as 29l/100k. Another thing I would say is don't go cheap on these, they may be a cheap car to buy but upkeep is expensive if done properly, AYC needs servicing at regular intervals, they love eating clutches if driven hard, although my car is still on the original clutch. Servicing is normal as per any car if you do it yourself. Other than that the VI's at least are great if you get a good car, I have 0 problems with mine, common problems to look out for would be clutch, wastegate actuator (although a cheap and easy fix), check for rust or previous damage as these cars are usually not bought to be driven miss daisy. Good VI's and VII's can be had for around the 28k mark, VIII's and TME's around the low to mid 30's for very nice examples, VIIIMR's from mid to high 30's. Hope that helps.