I finally came up with one I wanted to run it past
my compatriots here.

The window stickers.
With a little razor blade work you can make

Tank Full?

Don't get me wrong I'm as smacked down as anybody over
$4.11 for gas (here), but it seems like a pretty good dirk
in the side of a monster truck that might be behind you.

Any other suggestions?

 

My friend here says
Got Gas?

But I don't think there is the letters to do that.

Also, I was trying to use the words they had
so the letters would be straight.

 

How about
Go More Spend Less

but not sure if have letters for that either