I don't think you should automatically assume that, just because the car has 75,000 miles that the mileage it gets will be bad. we all went through an adjustment period when we got our cars and found out you have to work at it a little to get the really high (50s & better) mileage.
I started out at 37 off the dealers lot and now I'm up to low 50s in mpg.
read the learn section and all that's offered here on the site. first thing I did was pump my bridgestones up from the 35psi they were delivered at to 44psi they're rated for. my mileage went up about 7mpg instantly. yeah, the ride is harder- but I don't find any problem with handling. my car corners better than my old explorer for sure!
if you have 2 trip guages (like the newer HCH) use one for tank mileage and the other for individual trip mileage. I learned the most about how to drive efficiently with watching my instant mpg & trip meter and trying different things.
drive above your average: if you're getting 40mpg, try to drive with your consumption guage at 60mpg as much as possible- it works.
slow down & relax- hard to do sometimes, but leave a little earlier if you can and your mileage will improve. I find you can do really well at 35-45mph. depends on what kind of city driving you're doing. real stop and go is going to be impossible to get high mileage at because all the starting up from a stop sucks down the gas.
be patient and try some new techniques.

KLC
2005 HCH CVT 'Verdigeek'