Exxon Mobil have carried out independent fuel economy tests on two Volvo FM440 Euro V trucks, loaded to 75% payload (circa 32 000kg) and two Iveco Eurocargo 75E16 EEV Euro V trucks, loaded to 50% payload (circa 6.2 tonnes) which undertook a series of fuel economy tests under motorway driving conditions.

Mobil Delvac 1™ LE 5W-30 was used in the engine and Mobilube 1™ SHC 75W-90 was used in the rear axle for both vehicles, with Mobilube 1 SHC 75W-90 and Mobil Delvac 1™ Transmission Oil V30 used in the transmissions of the Iveco and Volvo trucks respectively. Changing only the engine oil using Mobil Delvac 1 LE 5W-30 helped achieve an average fuel economy gain of 1.8% when compared to using a mineral 15W-40 engine oil. With Mobil Delvac 1 LE 5W-30, Exxon Mobil have created an advanced heavy-duty diesel engine oil that can meet the technical requirements of current and future engines and help deliver enhanced fuel economy potential.

Statistically significant fuel economy benefits were observed when comparing the synthetic products to the mineral products with an average fuel economy gain of 2.0% in the Volvo engines and 1.7% in the Iveco engines for city driving conditions and 2.9% for highway driving conditions.

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