Buick vehicles, like most modern cars, typically require refueling every 300 to 500 miles, depending on the specific model and driving conditions. This range is based on the average fuel efficiency of Buicks, which can vary from around 20 to 30 miles per gallon (mpg) for sedans to around 25 to 35 mpg for SUVs and crossovers. The frequency of refueling also depends on factors such as driving habits, terrain, and weather conditions.

The reason for this range is that Buick vehicles are designed with a fuel-efficient engine and a fuel tank capacity that supports a moderate driving distance before needing to be refilled. For instance, a Buick Regal with an estimated fuel efficiency of 28 mpg would require refueling approximately every 350 miles if driven consistently. This estimate takes into account the average driver's habits, which may include a mix of city and highway driving.

Data from the U.S. Environmental Protection Agency (EPA) provides insights into the fuel efficiency of various Buick models. The EPA's fuel economy ratings for Buick vehicles are based on standardized test cycles that simulate real-world driving conditions. For example, the Buick Envision, a midsize SUV, has an estimated fuel efficiency of 25 mpg combined (city/highway), which would mean a refueling interval of about 400 miles under ideal conditions.

However, it's important to note that actual fuel consumption can vary significantly based on individual driving habits. Aggressive driving, frequent stops and starts, and carrying heavy loads can all decrease fuel efficiency and shorten the distance between refueling. Conversely, maintaining a steady speed and avoiding unnecessary acceleration can improve fuel economy and extend the time between refueling.

In summary, Buick vehicles generally require refueling every 300 to 500 miles, with the exact frequency depending on the model's fuel efficiency and the driver's habits. This range is supported by data from the EPA, which provides standardized fuel economy ratings for various Buick models.