Here are some likely culprits:
* Major engine malfunction: This is the most probable cause. Issues like:
* Extremely low compression: Worn piston rings, blown head gasket, or valve problems severely reduce engine efficiency, leading to terrible gas mileage.
* Faulty fuel injectors: Clogged or malfunctioning injectors prevent proper fuel delivery. A fuel pressure test is essential.
* Vacuum leaks: Large vacuum leaks disrupt the air/fuel mixture, causing poor combustion and low mpg.
* Ignition system problems: Worn spark plugs, bad wires, or a failing distributor (if equipped) can lead to misfires, reducing efficiency and wasting fuel.
* Catalytic converter blockage: A clogged catalytic converter restricts exhaust flow, putting a strain on the engine and drastically reducing fuel economy.
* Transmission problems: A slipping or malfunctioning automatic transmission would cause the engine to work harder and use more fuel.
* Fuel system issues:
* Leaking fuel lines or injectors: Fuel leaking before it reaches the engine is obviously a major problem.
* Faulty fuel pump: A weak fuel pump can't deliver sufficient fuel pressure.
* Driving habits (though unlikely to be the sole cause given the extreme fuel consumption): While aggressive acceleration and idling contribute to poor fuel economy, they can't explain such drastic results.
What you should do:
1. Don't drive the vehicle further: Continuing to drive with such poor fuel economy could cause further damage.
2. Check for obvious fuel leaks: Look underneath the vehicle for any signs of fuel dripping.
3. Have it towed to a mechanic: This is not a DIY job. A professional mechanic needs to diagnose the problem properly. They'll likely perform a compression test, fuel pressure test, vacuum test, and inspect the entire fuel system and ignition system.
This level of poor fuel economy points to a significant mechanical problem that requires immediate professional attention. Ignoring it will likely lead to further damage and potentially expensive repairs.
