[76stepsidechevy]

Ive run an old holley pro-jection 2d and currently run a fast ez-efi setup. I didn't see any notable mileage increase with either unless you count fuel saved by not having to let the truck idle for 10 mins on cold mornings. It does run good though, good throttle response and the ez efi pretty much tunes itself after you give it a starting point.