Severe driving refers to:
Heavier loads: cargo, passenger or towing a trailer
Rough or mountainous roads
Dusty or salty environments
Driving in extremely hot or cold weather
Actions you can take to reduce the effects of severe driving, such as:
Follow the “severe” service schedule in your owner’s manual.
Check fluids, including oil, and filters more frequently.
Have certain components such as brakes and shocks inspected more regularly.
Observe the speed limit. Gas mileage decreases rapidly above 60 mph.
Avoid quick starts and stops. Aggressive driving can lower gas mileage.
Don’t haul unneeded items in the trunk as extra weight will reduce fuel economy.
Keep your car properly tuned to improve gas mileage.