The Buick Excelle is designed for efficient fuel consumption, typically requiring refueling every 500 to 700 miles under normal driving conditions. This range can vary depending on driving habits, terrain, and vehicle maintenance.

The reason for this frequency lies in the Excelle's fuel efficiency, which is a result of its compact design and advanced engine technology. According to data from the Environmental Protection Agency (EPA), the Buick Excelle achieves an estimated fuel economy of around 28 to 35 miles per gallon (mpg) on the highway. This means that for a full tank, which can range from 12 to 15 gallons depending on the model, the vehicle can travel approximately 336 to 525 miles before needing to be refueled.

However, it's important to note that actual fuel consumption can be affected by several factors. Aggressive driving, carrying heavy loads, or driving in hilly or mountainous areas can significantly reduce fuel efficiency and increase the frequency of refueling. Additionally, regular maintenance, such as keeping tires properly inflated and using the manufacturer-recommended grade of motor oil, can help maintain the Excelle's fuel efficiency and extend the time between refueling.