Learn about the upgrades…
- Engine: A high priority upgrade as it will let you go much further on less fuel.
- Transmission: Getting to top speed might not seem very important initially but even the first few upgrades will let you go much further, especially when you can clear out zombies fast.
- Wheel: A decent upgrade but not a crucial one, I only suggest taking it early in later levels when uphill roads are more common.
- Gun: Opinions vary wildly on this one but I think it depends on the current level. Getting a gun means your car will not have to withstand a fair amount of zombie crashes, meaning it will not break as easily and you can move much faster in the starting areas. If you find yourself moving very slowly at the beginning, take the gun and do not look back.
- Boost: An extremely important upgrade augmented by the fact that boosters are very cheap. Buy one as soon as you can and upgrade it in between other parts.
- Weight Redist: By redistributing the weight of your vehicle, you can smash through zombies and obstacles easier. However, the change is very subtle so I would only take a single point on it after a few engine, fuel tank and transmission upgrades and leave the rest for later.
- Armor: This is pretty much the only upgrade that you will know when you need it. Do not take armor until your car starts breaking and even then, invest in a single point and only put further cash in it once your car starts getting destroyed again.
- Fuel Tank: Last but certainly not least, this is your bread and butter. Points in fuel make all the difference in the world so invest heavily on this one but not without keeping the Engine and Transmission upgrades in line too.