22. Increased fuel consumption
1. The air filter is clogged (chapter 1).
2. The ignition timing is set incorrectly (chapters 1 and 5).
3. The emission control system is faulty (chapter 6).
4. The fuel injection system is faulty (chapter 4).
5. Low tire pressure or incorrect tire size (chapter 1).
23. Gasoline leak or smell
1. The fuel supply or return line is leaking (chapters 1 and 4).
2. The fuel tank is overfilled.
3. The carbon filter is clogged (chapters 1 and 6).
4. The fuel injectors are faulty (chapter 4).