EFI vehicle recycle substantially more fuel than they burn.
EFI USED to do that in the 90s (and a few carb'd vehicles did that in the '60s, such as 440- and Hemi-powered Chrysler muscle cars).
But return-flow EFI pretty much went away with tightening emissions rules in the mid 90s. The reason for fuel return was to always keep the fuel in the rails (or carb on the older engines) cool, reducing vapor lock. The problem is that the fuel carries heat back to the tank as you drive. The constant circulation heats the fuel in the tank, increasing the evaporation rate, which increases pressure in the tank until the cap vents vapors. Returnless EFI keeps the tank cooler and reduces vapor venting.