re: Additional money off for buying two vehicles at once?

I'm no willcover but my guess is that it would largely depend on the margin the dealer is expecting.

If you're looking to buy vehicles with little to no markup you probably won't save a dime. If what you're interested in has an enormous markup then you could probably save a fair amount.

Put it another way - if you are buying two Bugatti Veyrons you could get a good deal. Two Kia's, you're wasting everyone's time.