Don't waste your time with magnets and CAI doesn't help with fuel consumption. Just helps with air intake.
You want a good FC car, don't buy the 4G15. Myvi has better FC. Savvy has better FC too.
If you already have the 4G15, make sure the following :
1. Engine is in tip top shape. Change whatever that is worn out or broken.
2. Use good fully synthetic engine oil 0W30 or 0W20.
3. Use high profile tyres (60 series) and small rims (14")
4. Empty your car of any excessive weight.
5. Get a performance air filter like K&N drop in. It'll help.
6. Don't drive higher than 2.5k RPM
7. Start off slow and steady, no sudden acceleration movements
8. Make it a manual. Auto cannot fight in FC.
9. No sudden braking and accelerating
Lastly,
10. Lose weight. The lighter the car is, the less fuel is needed to move it.
You want a good FC car, don't buy the 4G15. Myvi has better FC. Savvy has better FC too.
If you already have the 4G15, make sure the following :
1. Engine is in tip top shape. Change whatever that is worn out or broken.
2. Use good fully synthetic engine oil 0W30 or 0W20.
3. Use high profile tyres (60 series) and small rims (14")
4. Empty your car of any excessive weight.
5. Get a performance air filter like K&N drop in. It'll help.
6. Don't drive higher than 2.5k RPM
7. Start off slow and steady, no sudden acceleration movements
8. Make it a manual. Auto cannot fight in FC.
9. No sudden braking and accelerating
Lastly,
10. Lose weight. The lighter the car is, the less fuel is needed to move it.