[Shaguar47]

The DPFI is nothing of a true fuel injection, but it does have one primary fuel injector. It is basically just a souped up Carburator, thats all. MPFI is true fuel sequential injection as it has 4 injectors. You probably will lose some mpg but in turn you are gaining a better power band and more precious engine running. It also depends on what else is on the car. You could always throw the std 4spd or hf's 5spd on there and get a good mpg car with the added value of 4 injectors. But then again you could always get the hf model and just do some upgrading to run it off the si ecu. Either way, dpfi is not the way to go unless you want good ol mpg gains.