Poor Fuel Economy

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Mazda Tribute, 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, and 2003 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.

Check for contaminated air filter.
Check for engine cooling system malfunction.
Check for incorrect transaxle or transmission fluid level (A/T).
Check for weak spark from ignition system.
Check for poor fuel quality.
Check for erratic or no signal from CMP sensor.
Check for clutch slippage (M/T).
Check for improper operation of variable valve timing control system.
Check for low coolant level.
Check for inadequate fuel pressure malfunction.
Check for spark plug malfunction.
Check for PCV valve malfunction.
Check for dragging brakes.
Check for improper valve timing due to jumping out of timing belt.
Check for contaminated MAF sensor.
Check for incorrect engine compression.
Check for damaged trigger wheel on camshaft.
Check for restricted exhaust system.