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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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