Final answer:
Vegetable oil is typically used on the grill when making pancakes, with a full bottle providing more than enough for multiple batches.
Step-by-step explanation:
The type of oil commonly used for preparing pancakes on a grill is vegetable oil. Prior to pouring the pancake batter onto the cooking surface, a light coating of vegetable oil can be applied to create a non-stick layer and help in achieving an even golden-brown color on the pancakes.
Other oils such as canola, coconut, or olive oil could also be used depending on personal preference or dietary restrictions. The amount of vegetable oil needed for greasing the grill is relatively minimal, thus, ensuring that even with a full bottle of vegetable oil, you will have more than enough for cooking multiple batches.
When considering the amount of batter you can make, it's essential to remember that eggs are a critical ingredient and can limit the total number of batches. For instance, if you only have two eggs, you can only make two batches of pancakes, regardless of how much of other ingredients like milk, oil, or pancake mix you have.