I used to have a 2004 Hyundai Tuscon, and I recently junked my 99 Cougar and bought a 2001 Hyundai Santa Fe GLS with AWD. I liked the 04 which is why I bought the 2001. As far as fuel economy, after changing the spark plugs (fuel filter is next), I have it up to 22.5 mpgs. My 2001 is supposed to have a 17.2 gal tank; however, I think mine was swapped out to a 12 gal tank. The most I've even been able to put in was 11.2 gallons. Needless to say, the biggest difference in mpgs between the two hyundai suvs (I also had an 03 and 04 Tiburon) is that the 04 had the ability to disengage the awd and function as a FWD vehicle. This 01 does not. You'll need to check yours to see. There's also a difference between having a V4 and V6. My 04 was a 4 cyl and this 01 is a V6. So there's some trade-off in gas mileage vs. power. Moreover, The lack of space, etc. that I had in the Cougar (which was getting 29 mpgs before the trans developed issues--and still got 22 after but was a ticking time-bomb) is more than made up for in the Santa Fe.am little a bit confused please answer my questions friends is 2004 Santa Fe a good car? Anyone have any problems with it. How many miles can you go on a full tank? It has a 19 gallon tank.