To understand what features might be considered "grand touring" on a particular Buick Regal, you would need to specify the model year. The available options and packages varied significantly from year to year. Features that could fall under a "grand touring" description might include:
* Leather upholstery: Higher trim levels often included leather seats.
* Heated and ventilated seats: These add to comfort on long drives.
* Premium sound system: An enhanced audio experience is a common grand touring feature.
* Navigation system: Helpful for long journeys.
* Sunroof/Moonroof: Enhances the driving experience.
* Advanced driver-assistance systems (ADAS): Features like adaptive cruise control and lane keeping assist contribute to a more relaxed and safer long-distance driving experience.
In short, there's no single "Grand Touring Package" but rather several option packages and trims whose features cumulatively approached a grand touring feel, depending on the year and trim level of the Buick Regal in question.