[oil pan 4]

The other Web sites lay the BS on pretty thick.
One was recommending fuel line magnets, ionizers, water injection, fuel addtives and air bleeds.
Break it down real quiclkly, air bleeder only work on carburetors. Water injection only works on diesel, gas turbine and only works on gasoline engines under very specific circumstances, which you don't find in modern fuel injected engines.
Fuel additives are snake oil. Air ionizers also proven not to work. And gas line magnets, need I say more.

Other websites are only telling you to buy a more fuel efficient car.

Fuel economy dot gov is some what usefull. Telling you to preform basic user maintaince and buy low rolling resistance tires and that's about it.

So if you are not into buying a more fuel efficient car or maybe you already have and you already do basic upkeep and you still want more but are not stupid enough to buy into hho generators and fuel line magnets this might be the place for you.