CUMMINS
When they went to 24v the mpg dropped. My 12v doesn't hesitate to see 24mpg highway with a non lock up converter. My brother's 97 12v will get 28. Both trucks have fuel and turbo mods.

Edit we both get around 20 towing kinda heavy and not pussy footing them, they belch smoke from a stop, spool up and GO

Last edited by SpareParts; 11/09/13 06:37 PM.