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* Mobil Diesel Efficient claims are based on internal and third-party vehicle engine testing, laboratory testing, and/or industry or other scientific literature. Basis for comparison for all claims is versus unadditised diesel. Fuel economy and emissions testing was performed in the UK using on-road trucks. Vehicle type, engine type, driving behaviour, and other factors also impact fuel and vehicle performance, emissions, and fuel economy. Mobil Diesel Efficient may be used in other heavy-duty and light-duty vehicles, but results may vary.