LOL, imagine thinking a motorcycle or jeep would do you any damn good (especially after the gas you can siphon from abandoned cars has gone bad), when what you really need is a bicycle. Bikepackers and touring cyclists will be the kings of the apocalypse.
The earlier in the apocalypse, the more panicking humans running around, so you’re absolutely correct there. Unfortunately, depending on where you live and how early you realize what’s happening, the roads might be utterly jammed with no hope of getting away from population centers. The bike would be less of a tank, but you’ll almost certainly make it farther - but is that any good? Unless you’re confident in your ability to go full bear grylls, it might be best to just hunker down and make as little noise as possible for that initial pandemonium.
I’d probably stay clear of basically anywhere that you’d wanna go in an apocalypse for those 72 hours, because everybody else has the same idea. Find somewhere with a second story, block or preferably destroy the staircase, and stay as quiet as possible while scavenging what you can.
There are diesel Kawasaki KLR motorcycles that will run on literally anything, not that they’re very fast but they would at least preserve your stamina for when you need it.
They’re also extremely robust and simple to repair.
Assuming best case scenario (a new jeep is shat into my driveway with a full tank of gas) I think the jeep is a MASSIVE boon. It increases movement ability and hauling capacity, and can be used to clear many obstacles you'd otherwise have to go around. Is its life finite? Yes, but it'll give you that leg up at the start of the situation that may very well set you up for success long term.
Anything blocking paths. Can't move broken vehicles, downed trees, etc with a bike. Sure a bike can go around, but with a jeep, I can go through, and have space to haul a bike back.