SOURCE: What are the possible causes
I've come across some with engines that needed a tune up, but in some cases it's the automatic transmission that is not working correctly causing bad fuel economy. What do you think is the problem in yours?
The first thing is to check for fuel leaks and for restricted intake or exhaust and ensure the routine maintenance is up to date.
It is important to know what the current fuel consumption is in miles per gallon or km per litre. The modern trend of paying set amounts of money gives a wholly false impression of actual fuel consumption.
When checked accurately over a period and averaged to take account of different types of driving conditions, freezing temperatures and so forth, mostly the result is found to be not as bad as first imagined.
If all checks are found to be ok and the accurately checked consumption is still too high further checks will be needed.
A few possible faults are incorrect fuel pressures, bad injectors, incorrect valve timing, "tired" oxygen sensors, bad thermostat, "tired" temperature sensors...
Wheel alignment, tyre pressures and binding brakes can also be factors...
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