Poor Fuel Economy

Definition: Fuel economy, as measured by an actual road test, is noticeably lower than expected. Also, economy is noticeably lower than it was on this car at one time, as previously shown by an actual road test.

^ Check owner's driving habits. Is A/C on full time ("DEF" mode on)? Are trips too short to let engine warm up? Are tires at correct pressure? Are excessively heavy loads being carried? Is acceleration too much, too often? Has driver read "Important Facts on Fuel Economy" in Owner's Manual.
^ Check air cleaner element (filter) for dirt or being plugged.
^ Perform careful visual check as described at start of Symptoms. - Visual/Physical Underhood Inspection
^ Check ignition timing. See Emission Control Information label.
^ Check EST operation.
^ Remove spark plugs, check for cracks, wear, improper gap, burned electrodes, or heavy deposits. Repair or replace as necessary.
^ Check compression.
^ Check Viscous Converter Clutch (VCC) for proper operation.
^ Check for restricted exhaust or catalytic converter.
^ Check for dragging brakes.
^ Fill fuel tank and check fuel economy to verify fuel data panel accuracy.