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Could be a lot of things/variables, foremost how are you calculating your mpg?
Personally I wouldn't worry about it, and it'll definitely not be due to the service.
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"I love dinosaurs so much that I’ve based my life on burning as much black melted dinosaur flesh as I can on a daily basis...even the screaming sound of prehistoric reptilians being burnt through any of the classic Japanese four cylinders gives me great joy."
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