I have a 2011 Buck with 147,000 miles on the car But the engine has only 50,000 miles- so how would I sell this auto through you and get the correct selling price???

I'm sorry, I don't believe you understand the concept of a replaced engine in terms of value. Sure an engine replacement adds value to the car, but it doesn't make the mileage automatically go down. Its still worth the same as a Lucerne with 147k miles, you could maybe bump up the price a couple hundred because of the engine, but that's really it. It still has 147k miles.

But I have a problem with your answer to my question: 1) I can put the 147K miles BUT do I put the correct price at your website to sell my car through your website????? 2) Your website only allows me to answer some questions like 147K -now how do I note the engine has 50,000 miles & how do I change the price to the correct price to sell my car?

First of all, this is not my website, I'm just a guy on the internet who found your question and thought I'd help out. Secondly, I'm not sure how much your car is worth. You can look at Kelley Blue Book if you want an accurate value for your car, just be sure to put 147k miles instead of 50k. Third, you can simply put in the description that the car had the engine replaced 50k miles ago. Again, I'm not sure how much value it adds to the car, but I can guarantee you its not a lot. Maybe $100-400 is my rough estimate, but even then for 50k miles already on it its not exactly a newly replaced engine. TL:DR; I'm not sure, do some research

This still does not address my question. ONLY SOMEONE FROM "CARGURUS" CAN GIVE ME ANSWERS TO THERE WEBSITE. The general public can't speak for CarGurus it's there website and this is where the problem is and only someone from there website can address my problems I'm having with trying to sell a car here at through website.