Alright, I know these things are not exactly easy on gas. But my 5.0 that I recently purchased is getting between 10 and 13mpg. That's horrible. I know it should be getting a little better than that. On the highway it gets less than 20. The only mods it has is Crane Fireball ignition, BBK headers and off road H pipe, MAC mufflers, and its been switched to mass air with a A9L computer. Does she just need a tune up? Or is one of those mods eating all the gas? Thanks.