It's a good deal but, the difference between the V6 and I4 is not much when it comes to mileage on any of the 4x4 KL models.
16's and up haven't been on the road long, the only problems with the 15's and 14's were oil consumption issues with the I4's but, they haven't been reported much lately.
With the mileage you are stating, suggest a MaxCare Extended Warranty with Unlimited Miles and Years, it's and extra 2500 to 2800 but, worth for the long haul or long miles. Clay at Zeller Motors can get you the best price unless your dealer matches, mine did so I got lucky.
Either way, good luck with the purchase.
2016 TH, V6, C&C, Tow group, 8.4AN, leather, Cold Weather, Command Sunroof, Black wheels, & Black. Maxcare Unlimited Miles and Years $100 Deductible.