Based on this analysis, nine diesels had five-year ownership costs that are lower than equivalent models with gas engines, as detailed in this slideshow.

FORBES: The Diesel vs. Gas Showdown

In fact, dealers located within a 50-mile radius of a major city generally offer lower prices on equivalent models than their counterparts located in distant suburbs and rural areas.

FORBES: Used Car Prices Stay High -- Here's Where To Find The Best Deals

Dealers located within a 50-mile radius of a major urban center were found to offer lower prices on equivalent models than their counterparts located in distant suburbs and rural areas in nearly all U.S. states.

FORBES: Where To Find The Best Used-Car Deals

There is the equivalent of a technological arms race as modern fund managers vie to find the best computer models and to trade quickly before their competitors spot the same opportunities.

ECONOMIST: Investment management