How Big is the Gas Tank on an Audi Q5? The Audi Q5 has a gas tank size of 19.8 gallons (75 liters). This is slightly larger than the average fuel tank capacity for a mid-size SUV, which is typically around 18 gallons (68 liters). The Q5’s large fuel tank allows it to travel up to 500 miles on a single tank of gas. What are the Benefits of a Large Gas Tank in an Audi Q5? The Audi Q5 …
