Using this formula with the winter season set above, the energy efficiency savings of the VHVI multigrade can be calculated versus the ISO 22 hydraulic fluid.
Winter energy savings
= (23.8 * 55.3) / (24.2 * 45.3)
= 1,316.14 / 1,096.26
= 1.2005728 &endash; 1 * 100
For the summer season set above, the energy efficiency savings of the VHVI multigrade versus the ISO 46 hydraulic fluid is:
Summer energy savings
= (23.9 * 48.4) / (23.9 * 46.2)
= 1,156.76 / 1,104.18
= 1.047619 &endash; 1 * 100
Knowing the energy efficiency savings percentages, the diesel fuel savings that results from switching from an ISO 22 hydraulic fluid in winter and an ISO 46 hydraulic fluid in summer to a VHVI multigrade year round can be calculated. Diesel fuel savings are calculated based on gallons of fuel used for a given amount of work.