Regular Maintenance
 

• Ensure timely oil changes to enhance lubrication and reduce friction in the engine.
• Regularly replace air filters to maintain optimal air intake and combustion efficiency.
• Keep the engine tuned up and address any check engine warnings promptly.

 
Proper Tire Inflation
 

• Check tire pressure regularly and maintain it at the manufacturer's recommended level.
• Underinflated tires increase rolling resistance, leading to reduced fuel efficiency.

 
Use Quality Fuel
 

• Use the recommended fuel grade specified by Audi for the A4.
• Higher octane fuels might be recommended for optimal performance and efficiency.
• Consider using fuel additives that clean the fuel system and improve combustion efficiency.

 
Efficient Driving Habits
 

• Avoid rapid acceleration and harsh braking to reduce fuel consumption.
• Use cruise control on highways to maintain a steady speed and improve efficiency.
• Stay within speed limits, as higher speeds generally result in increased fuel consumption.

 
Limit Extra Weight and Drag
 

• Remove unnecessary items from the car to reduce weight and improve fuel efficiency.
• Use aerodynamic roof racks and avoid excessive load on them to minimize drag.
• Keep windows closed at high speeds to reduce wind resistance.

 
Optimize Air Conditioning Use
 

• Use air conditioning judiciously as it can increase fuel consumption.
• In mild weather, consider using climate control at a moderate setting or venting air instead of running the AC at full capacity.

 
Check Wheel Alignment
 

• Regularly inspect and correct wheel alignment to prevent increased rolling resistance.
• Misalignment can cause tires to wear unevenly and reduce fuel efficiency.

 
Utilize Technology and Car Features
 

• Use the car's start-stop system if equipped, to conserve fuel when idling.
• Monitor your driving habits and fuel consumption through the onboard computer and adjust accordingly for efficiency.