For example, the '96 Toyota Hilux Surf a friend of my old college buddy's son bought recently. You have probably never heard of the Hilux – even though you have probably heard of the 4Runner.

They are both the same thing, except for one very important thing. 

The Hillux Surf is powered by a 3.0 liter diesel engine and is capable of better than 40-miles -per-gallon. This is about twice the mileage you'd get out of a 4Runner, which was only available – in the United States – with a gas engine. 

You might ask, why? – given the pretended governmental obsession with high fuel economy uber alles, the foundational justification for the federal government's Corporate Average Fuel Economy regime. Well, because it is just that.