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Why Your Gas Mileage Is So Low  
INFORMATIVE 

Tags: gas, mileage, tips, how to, mechanic, improve, fuel, fuel economy, car, truck, van, suv

If your fuel economy is excessively low, your vehicle may need to be serviced or repaired. You may want to contact your dealer or a reputable repair facility to check your vehicle. The following are some of the diagnostic checks a mechanic will typically conduct for poor MPG:

	Perform "On-Board Diagnostic System Check" for diagnostic trouble codes (sensors or actuators which may be malfunctioning)
	Check for dragging brakes
	Check transmission shift patterns for slipping, use of all gears, lock-up operation
	Check ignition timing
	Check owner's driving habits including A/C usage, hard accelerations, carrying heavy loads
	Check emission control system
	Check vacuum hoses for leaks, kinks, proper routing
	Check tire pressure
	Check fuel type, quality, and alcohol content
	Check fuel pressure and fuel system for leaks
	Check air cleaner element
	Check coolant level
	Check ignition system for wet plugs, cracks, wear, improper gap, burned electrodes, or heavy deposits, cracking or improperly connected ignition wires
	Check for proper calibration of speedometer
	In extreme cases, there may be engine problems such as poor compression or faulty fuel injectors

Lister: john
Source: Fueleconomy.gov

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