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The gasoline options for the 2005 Volkswagen Jetta, excluding diesel engines, require 87 octane regular unleaded fuel. Octane rating determines a fuel's ability to prevent engine knock or ping. In the United States, regular gasoline typically has octane ratings of 87, midgrade ranges from 88-90, and premium from 91-94. It is generally best to stick to the regular octane recommended for your vehicle, as using a higher octane fuel usually does not provide any additional advantages in terms of performance, speed, mileage, or cleanliness.
The gasoline-powered engines in the 2005 Volkswagen Jetta use 87 octane Regular unleaded fuel, while the diesel engine option requires #2 diesel.