In a densely populated area such as West LA there is a gas station every half mile - what is the use case for this except "oh crap, I didn't fill up and I don't

In a densely populated area such as West LA there is a gas station every half mile - what is the use case for this except "oh crap, I didn't fill up and I don't have 10 min in morning to get gas". An average tank size is circa 16-18 gal - so a courier would literally do a single trip to station per car? How will you deal with gas tanks that lock with the car, ie BMW, MB, Audi? 5$/fill up works out to .30c per gallon premium over regular fillup on an average tank - which is quite high. If the service is not done by a fuel truck, but an amateur worker, what kind of insurance do you carry for when they accidentally put gasoline into my diesel car? Lastly, from logistics side, how does a human know when to stop filling the car so as not to overfill the tank? Listening for the funny 'oh shit it's about to start spluttering out of the tank!' noise? Edit: found it - check 'materials of trade' in 49CFR - you cannot transport more than about 120gal (in 8gal containers max) without a CDL or hazmat designation. The only way this can be economical is if you don't run to gas station after servicing each car? Or is there a big part of economics here that I don't see? Even buying gas at wholesale but selling at retail plus service fee, I don't see this being scalable while also paying above minimum wage to the gas mules.