Opinions on 2007 Pete 387 C15

I'm about to pull the trigger on a 2007 387. C15 475hp 1850 tq 3:36 rears 22.5 rubber. 730kms its in real good shape has an APU with a new alternator on it 2 brand new leather SEaRS seats. Recent overhead and dyno run showing its very healthy and clear oil samples from everychange. A couple cosmetic scratches etc to fix, needs a windshield has a small split at the bottom, rubber is 75% drives 50% steersall Michelin Virgins, needs new driving lights.
Questions,
can you buy warranty from Cat on the engine?
Its showing a lifetime of 6.7 mpg from the ECM is this US gallons and how accurate would that be?
Price is $45k. Is that in the ball park?
Thanks
Colin.

 

He had a full dyno ECM done when he brought the truck off the road to sell a couple months ago at CAT and idle time is 11%. It was making 505hp. Cat says the engine is great. He had an oil sample done at the same time. He has 2 trucks. He let his driver go that was in his old freightliner and he's driving that. Its paid for and he's winding it down sort of semi retiring I guess so he wants to sell the 387 as it still has 24 pmts left so he will be payment free and have to work a lot less.

 

Truck is scheduled at pete in the am for a MVI check then CAT mon am to do another dyno and oil sample. I want to make sureits ok.

 

Peterbilt is checking for MVI tomorrow and drawing samples from rad, engine, trans, and both diffs and sending it to cat. Mon 8 am it goes on the Dyno all will be told then. It is a NXS motor so it is pre emission. I've never had a Cat always Detroit and Cummins in my previous trucks. I just got rid of a one year nightmare with a new Crapcadia I took a small bath on so I'm checking EVERYThing before purchasing. I would be doing a glider but can wait till next year for a truck so after 5 weeks of searching thiS is the best deal I can find. I plan on having it for 2 yrs it will be paid for in a year and half, IF the new PaCCAR engines work out ill prob order a 388. But if it ends up a great truck I may keep it for a while. Time will tell!!