The car could have had the entire odometer cluster replaced.

Look at wear on pedals and carpet,tires,how dirty(or how clean!)it is in
the engine compartment,and I believe you can check with the state,some
states record mileage when renewing your registration.
Also,the title has to have the correct mileage when selling the car.

OTOH;
My 94 Integra GSR only has 55,600 miles on it to date,and I am the original
owner;I just don't drive many miles.(it's a mechanical odometer,too.)
I've been driving it since Oct-93!

Has it only had one owner?  Ask the seller for more information about
why the car has so few miles.  I purchased a 1987 in 2003 that only
had about 60,000 miles on it, and the mileage was correct.

After a few phone calls and faxes, I found out the previous registered
owner had personalized plates on it, and had three other cars
registered to her at the same time as that one.  After finding out
that and her zip code I had no reason to doubt the mileage.

As another case, my friend just received his grandfather's 2000 Civic
Si with only 10,500 miles.  No reason to doubt that at all.  A
neighbor sold a 9 year old Buick with 6,000 miles before.  My friend's
dad sold a 1983 Mustang GT CV about 1996 with only 13,000 miles.

Some people just get a car for fun or don't drive much, and they no
longer can afford it (whether space, insurance, or just too old), or
they just don't want the car, or they get sick or die.

The real question is why do you doubt the seller so much?  Make sure
there are no problems, and don't expect any warranty to transfer
regardless of legalese that says it will.  I got screwed by the exact
mistake of assuming since a warranty said it would be transfered to a
buyer, it actually would.

Dave