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Fuel consumption?

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4.2K views 32 replies 6 participants last post by Assi Jan 3, 2025

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If your 2015 Jeep Cherokee Trailhawk (3.2L) is experiencing significantly worse fuel consumption than expected (e.g., 20L/100km or 11.8 MPG in the city), here's a breakdown of potential causes and troubleshooting steps discussed in the forum: * **Tires:** Ensure front and rear tires are the same diameter to avoid drivetrain damage. BF Goodrich KO2 tires, while suitable for off-roading, are heavier and can reduce fuel economy. Maintain proper tire inflation (around 36 PSI). * **Brakes:** Check for dragging brakes. Jack up each wheel and ensure they spin freely. * **Fuel Quality:** While the manual recommends 95 octane fuel, 85 octane should also work and save money. * **Wheel Alignment/Suspension:** Get a 4-wheel alignment check and inspect the suspension for worn parts. * **Ambient Air Temperature Sensor:** Ensure the ambient air temperature sensor is properly located in its plastic bracket near the driver's side air dam, not near the radiator, condenser, or transmission cooler, as an incorrect reading can affect the fuel mixture. * **Engine Ticking:** Ticking noises in the engine may indicate worn roller arms, which can affect fuel consumption. Inspect and replace if necessary. * **Fuel Injectors:** Inspect fuel injector O-rings for damage, as bad O-rings can cause unmetered air to enter the plenum, throwing off the fuel/air mix. Clean or test the fuel injectors. * **Purge Valve:** A faulty purge valve can cause poor fuel economy. Consider replacing it. * **Start/Stop System:** If the start/stop system isn't working, the engine is running at 0 MPG when stopped. Fixing the start/stop system (IBS) can improve fuel consumption.

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g.raichev

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#7 · Jun 24, 2024

Hmm my Canadian 3.2 Sport on a 95 unleaded gas is giving me about 13l/100km on heavy traffic in the city and about 9l/100km on a highway @ 130-140km/h with rare sprints to 190

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