vehicle customisation would be kinda intuitive,m scrap metal to armour up your engine bay, doors windows etc, as well as fitting a GPS to the dash also, i agree with what seems to be the current consensus, that vehicles should be everywhere (they wouldn't just vanish after the infection), and not always totally boned (except for helis, which would need parts AND TIME to fix up to being workable, but should need a green engine to run for more than a few minutes, good tyres to go off road. then make fuel teh hard thing to find, after all, the oil rigs won;t be churning the crap out of teh earth wil they? and the fuel depo should be a good spot to look for some (but probably crawling with bandits/hijackers), relying on either group raids to fill up oil tankers (from which jerry cans can be filled) and keep safely tucked inside a cozy base, far away from bandits, where you can sell it onto desperate survivors for their beans/ammo/valuables ("ill fill your hilux for you, good sir, if you give me a can of mountain dew" :D) then make a wide range of civilian vehicles, with realistic gear capacities (proportional to the size of the boot, so a huey won't actually have that much room, but a pickup would have LOADS), and watch the carnage at the fuel depot as for the fuel depot, im thinking of a large walled complex, with one wide entrance for tankers/vehicles at the front, and a couple of smaller ones round the perimiter for hiking survivors to sneak in through to the main loading bay, where you can get access to limited fuel (regenerates slowly, but can hold loads) the fuel in the tank slowly regenerates (probably enough to fuel half of what we want to use), and EVERY time fuel is taken out, its lost from the tank the tankers should be about 3-4 per server, hold an insane amount of fuel in the back (as much as you can find basically), but slow to drive, and would need armouring on teh tanks to protect from sadistic bandits ("that's alot of fuel you have there, now watch it come out of my 50 calibre hole onto the road!") (note a hole at the top of teh tanker should set its maximum fuel level to drain at the top, but a hole at the bottom would drain it empty) also, vehicles everywhere should spawn with a little bit of fuel (except for broken fuel tanks) which can be siphoned off using a jerry can and a hosepipe at the risk of ingesting toxic petrol/diesel (lets just assume that either one will make you VERY ill) or with a hand pump (rare find) and jerry for safer extraction