Haha, I don't think it is THAT huge of a deal.  You max out at 24 hours of double XP.  But that means you have to buy 96 bottles of Mountain Dew, or 96 bags of Doritos, or a combination of the two to max out.  That is some crazy money.  I have about an hour now, but that is because I drink a Mountain Dew just about every day anyway haha.  I hope to get about 2 hours so, so after I get used to playing the first day or two, I can redeem my double XP.  That might put me like.. 2 levels ahead than if I didn't.  So I wouldn't take it as unlucky to not have it.

The only real reason I even signed up to get my double XP is the chance to win that Jeep haha.  However unlikely that will be.  I have a wife and son, and we own 2 vehicles, but mine is a Mazdaspeed Miata... not enough room for everyone in there, but it is pushing 250rwhp so I don't want to get rid of it either.  250 doesn't sound like much... unless you are in a car that weighs under 2400 pounds.  But I digress...