That and the increasing prevalence of electric cars, Uber, and other shifts are why the gas-delivery model will likely be unsuccessful over any reasonable duration.

The idea seems to be moving in the opposite direction as the rest of the world.

Almost no convenience stores make money on gasoline, unless they're operating a special setup (the convenience store chain Sheetz for example has tried to build out their own gasoline business to cure this problem). There are a few routine exceptions, usually involving either some kind of rare location (eg right outside an airport exit, usually operating under a special arrangement), or a rare event (something that causes gasoline to be in unusual demand / limited supply).

Profit on gas was measured in cents per liter, with premium giving the best margins. And by best I mean $0.023/L or $0.087/gal.