I call it super marketing, cos they know most people who go in to buy a new car has the prices of gas in their mind. Plus people (most) dont sit and calculate all this, they read, gas for $2.99 for threeyes, 12K miles a year and they jump on the deal.
Its like incentivised offers. I have given a way free DVD players to users who signed up for 12 months worth of adult videos from me
. DVD player cost me only $29.99 from costco, I made 10 times more from comission from these horn dogs LOL.
How long the DVD player worked wasnt my problem, hehee , but most costco stuff are pretty good.