It takes less than 5 mins to dig up an online trip report where somebody flew a hang-glider with a lawn mower strapped to the back of it, from the UK to Kathmandu, or whatever.
Whether this is practical, or whether the number of pilots that actually do it could or could not be counted on a couple of fingers, is another matter.
Wouldn't we all love to be burning car petrol? The other day I filled up with 221.4 litres (159kg) of avgas. How many jerrycans would this be? With my back, I can barely lift one full size jerrycan out of my car boot and carry it any distance.
There are many different communities within GA, with different requirements and with different levels at which "user satisfaction" can be achieved.
50USG is 136kg. If you filled a rubber bladder with that lot, in the back of your car, and assuming the exhaust is still off the ground, about the only thing you will be able to do is find an industrial waste disposal company to come along and dispose of the contents
