* Fuel efficiency is primarily determined by engine efficiency and driving habits. Heating the fuel lines doesn't address these fundamental factors.
* Cold fuel is already atomized and burned efficiently in modern engines. While cold, thick fuel can slightly hinder flow, modern fuel injection systems are designed to handle this. The marginal improvement from heating the lines would be negligible, if any.
* Heating the fuel increases energy consumption. The energy used to heat the fuel lines is ultimately drawn from the vehicle's power source, thus reducing overall efficiency.
* Potential for damage. Improperly heating fuel lines could damage the lines themselves, leading to leaks or other safety hazards.
In short, the idea of heating fuel lines to improve mileage is a misconception. Focusing on proper vehicle maintenance, efficient driving techniques, and fuel-efficient driving habits will yield far better results.
