I had this idea when Glenn from The Walking Dead when he said he was going on that mission on the Hotel.
How about being able to siphon fuel out of cars? To do it, you would need a "Siphoning Kit" (Hose, Empty Can/Bottle/Small Can) taking a spot in Active Gear, more time than normal to do it (Fuel coming out of a hose would take some time, right?) and to be defended while doing so.
Why? More variation in ways to get fuel and it would be more realistic than to find Cans of fuel just lying around. So the Fuel drop rate should be lowered in my opinion, to balance it.
EDIT: Another idea, the Siphoning Kit would have Empty Bottle, Empty Small Can or Empty Can versions, where each one, respectively, would take less time to siphon, but would give less fuel in exchange.
Edited by Lucio 1995, 21 April 2013 - 01:44 AM.