How about impressively low miles? Dad just replaced his '02 F350 7.3L Power Stroke with 120K with a 2007 GMC Sierra 2500HD with the LBZ Duramax with 56k on it (grandpa's truck).
Most impressive thing is his total out of pocket on the two trucks. He bought the 7.3 back in like '09 with 50k on it for $25,000 and sold it to a local guy for $22,500, so he drove it for about 75k miles and 13 years and he lost $2,500 on the truck. It breaks down to about $16 of depreciation per month. Then he purchased the LBZ for $28,000 from his father in law (my grandpa), who purchased it new in '07. The sucker gets so lucky with crap like this all the time haha.