Unless you plan on logging tens of thousands of miles per annum.
You'll see more pain than gain with any Efi system. Imho.
Even IF your mpg shows marginal improvement, you're upto $10k behind to start with. Im pretty sure one can invest $10k to cover the mpg loss elsewhere and not suffer the pain lol.
Further having investigated them at infinitum, those hand held carbed ezy-Efi gizmos just can't be made to work anywhere near as well as advertised. I contest any claims to the contrary (till I see with my own eyes). I've just seem so many that don't work, either at all, or so poorly that a bad carb would be better.
Efi is great for your daily driver, else not so much for your part time drive.
Good luck with it.