Well, lets do process of elimination:

Merc drivers cannot possibly do mods, because they are too busy constantly repairing the car itself anyways.

Range Rover drivers take the car off-road occasionally, so I do see them doing some "off-road" type mods, but nothing serious. I mean, they already depreciate like a piano falling off a tower. Realtors don't have time for mods either.

GM? I guess this might be the winner in terms of mods. Annoying exhausts, bling bling stuff, lowering their pickups.

When was the last time you saw a modded Highlander?...........

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2014 Mazda 3 GT: Ø Consumption: (click for details)