Barely six months have passed since our last review of car sharing yet there have been a plethora of developments since then. This week alone saw GM expand its Maven car sharing platform to accelerate the 'gig' (freelance) economy. Continuing QUBE/just-auto's series of research snapshots, this one takes another look at this blossoming market. Car sharing schemes allow us to rent cars for a short period on an ad hoc basis.