Cars have to be built specially to handle E-85. They are typically called
"flex-fuel" vehicles.
More and more of these are being built all the time by more and more
manufacturers. As I understand it, the number and availability of tax
incentives to buy these are also growing by leaps and bounds. Hyundai and
Kia will apparently join the "flex-fuel vehicle" rush in 2007.
As for modifying a current vehicle, I won't say it's impossible, but so much
would have to be modified, I doubt any kits will be made available, unless
there are some very committed people out there.
I would also ask people to think carefully before buying a vehicle that runs
on E-85, unless it is a true "flex-fuel" vehicle, meaning it can also run on
regular unleaded. For now, the availability of E-85 is limited, meaning
unless your driving is totally local, you may have some problems finding a
station that supplies it out of your area. As I understand it, that is
changing rapidly also.
Ethanol plants are being built and proposed left and right. I think you
will find that this is a phenomenon that will become a very real part of our
fuel future in the years to come.
But for now, sorry but I don't think this will help your Elantra and Santa
Fe.
Hope this helps.
Tom Wenndt