OUR-WHEEL DRIVE VEHICLES OFTEN EXPERIENCE poor fuel efficiency. Four Wheeler
Editorial Director Douglas McColloch offers the following tips for increasing fuel efficiency
in four-wheel drive vehicles:
- After installing bigger tires, you should re-gear the axles to ensure optimal engine RPM at
cruising speeds. The speedometer should also be recalibrated.
- If running a three-speed transmission, consider an overdrive unit. A manual
transmission also provides an increase in fuel efficiency.
- Ensure the engine and fuel-delivery system are tuned. Improper carb jetting, clogged
injectors and filters, improperly gapped spark plugs and worn out O2 sensors
can decrease fuel economy.
- Install freer-flowing aftermarket air filter and exhaust components that improve
intake and exhaust flow.
- Use synthetic lubricants for reduced wear, better viscosity retention and longer
- Keep tires properly inflated and wheels aligned.
- Install an electric cooling fan to replace the stock belt-driven fan.
- During the winter months, shed excess weight such as lightbars, nerf bars, side
steps, jerry cans, auxiliary lights and storage boxes.
- Turn off the A/C when it is not needed.
- Avoid short trips, jackrabbit starts and too-high (or too-low)