Fuel

Fuel allows the rocket to speed up Turtle when in the air.

Fuel Amount upgrades
Each upgrade increases the Fuel amount by 10 units.
 * Level 0: None (30 units)
 * Level 1: 90 (40 units)
 * Level 2: 200 (50? units)
 * Level 3: ? (60? units)
 * Level 4: 1,300 (70? units)
 * Level 5: ? (80? units)
 * Level 6: ? (90? units)

Fuel Consumption upgrades
Each upgrade increases the fuel economy of the Rocket.
 * Level 1: 80
 * Level 2: 150
 * Level 3: ?
 * Level 4: ?
 * Level 5: 650 (requires Achievement #13)
 * Level 6: ?
 * Level 7: ?
 * Level 8: ?
 * Level 9: ?