Do not automatically purchase any special fuels. When you start a session, whatever premium fuel you can afford is automatically selected. Manually change the selection to the regular free fuel to save money. Use your savings for car upgrades. Save fuel by allowing your momentum to roll you downhill.
Jumps
After a jump, try to land on all four tires to lessen any potential damage, as well as allow you to get back to speed quickly. Missed jumps can damage your engine badly. Do not make jumps to higher paths unless you are sure that you will land them properly. Use the boost to make difficult jumps successfully.
Progression
You are rewarded to how far travel. Get as many miles as possible. The number of zombies you hit is also important. Always choose higher paths when possible. The upper areas usually have fewer obstacles.
Upgrades
Purchase fuel capacity and engine upgrades first. This will allow you to travel further and earn more money.