One of the Kardashian-Jenners is still getting good use out of the Jeep Wrangler Sahara French Montana bought Khloe K for her birthday ... it's just not Khloe, it's Kylie.

Kylie was spotted in the $50,000 whip while cruising around Calabasas -- and older sis, Kendall has also been driving it around town.

As TMZ previously reported, the SUV was part of French's 30th birthday gift to Khloe -- who's clearly no longer riding the gift. Or the gift giver. 

Good thing Kylie's driving record is impeccable ...ish.