What grade of fuel does the Audi A4 use?

If you refuel your Silvercar prior to returning, please note that the Audi A4 uses premium-grade fuel only. 

If you don't have time to fill up,  Silvercar's fair fueling promise means you are only charged what you would pay to top off the tank with premium gas, plus a simple $5 fee for us to take care of the refueling task.

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