Electric and other alternative power vehicles are all the rage when it comes to sustainability as regulations begin to propel fleets to phase these vehicles into our day-to-day operations. While EVs and alternative fuel vehicles address greenhouse gas (GHG) and California Air Resources Board (CARB) regulations, there are best practices that fleets can use while still running diesel powered equipment to lower their carbon footprint.
Fleets will increase their sustainability efforts greatly by closely monitoring tires, engine parameters and oil sampling.
Tires can be an important contributor to fuel economy. Maintaining tire pressure within 5% under to 20% over the recommended pressure can lead to a 2% increase in miles per gallon.
The rolling resistance of a tire decreases as it wears, providing an added benefit to fuel consumption. For example, a 30% worn tire would experience a 2% savings; 50% worn tread would gain 4.5%; and an 80% worn tread would add an additional 6.5% to fuel economy. If the rolling resistance decreases by 10%, the result is between a 2.5% to a 3% decrease in fuel consumption. While it is wise to run your tires to pull points, do not run tires out of Department of Transportation (DOT) specs while chasing MPG gains.
Tires typically lose 1.5 to 2 psi of air pressure each month and there is a change of 1 psi per each 10 degrees of temperature change and every 2,000 feet in altitude. How often you check and adjust your pressures will increase the life of your tires and increase your MPG.
The correct engine parameter settings can have a direct impact on MPG. There are a variety of parameter settings that can be adjusted to optimize fuel economy, including road speed, speed at cruise control, PasSmart/reverse speed, adaptive cruise control, predictive cruise/IPM, E–Coast/Smart Coast, crest and dip coasting, idle shutdown times, optimize idle and vehicle acceleration management.