If the Honda has retained its resale value, and doesn't have any gross mechanical issues, I'd say go ahead and sell it if the Elantra is an economical/practical choice

I had a hard time getting rid of my 85' Bronco (we'll say emotional attachment). But then gas prices doubled for a period of 6 months, and made the choice pretty easy. Sadly, last we saw anything of it, it was left abandoned and immobile in the south Anchorage Carrs parking lot with its plates/VINs removed. My dad made sure the authorities knew we'd sold it to my sister's then boyfriend some months prior.

See if you can find it a good home. But keep in mind that it is an expensive tool, not a pet.