Anyone else only getting 12 mpg on their Boss?
I get 15 on my 608rwhp Cobra

 

Have you tried resetting the display pannel? I was getting only 16.2 no matter how slow I went. After resetting everything It now reads 17.8. Not a huge difference but it is something. I can't answer why, but this is what I did. Figured it was worth a try. Look at the owners manual under instrument pannel and it will show you how to reset everything.