Not Sure About This Practice
There is a reason that there is reserve. If you can find a Gas station just pump. If not, find the nearest next gas station ASAP.
It's not a good idea to rely on Gas reserve, it might damage the pump, etc
All of these vehicles are bad chcioes for the apocalypse. They're mostly custom, so finding spare parts will be nigh impossible, unless you live near a production facility to begin with. They're extraordinarily expensive. Based on their size, I'd say they use fuel very quickly.Your best bet? An old, domestic diesel pickup. Parts are cheap and easily available- there are probably already half a dozen in your neighborhood. They're easy to work on; very, very capable with some minor upgrades; and much better on fuel (and being diesel, you can make your own because the refineries won't be up and running, nor will existing supplies at gas stations be fit for use after a few months). And without a modern computer onboard, you don't have to worry about replacing silly electronics. Post-apocalypse, you want your vehicle repairs to be as simple as possible.