I'm having continuous issues with horrible gas mileage on my 94 Camry, I'm getting 10mpg- I've replaced the wires, plugs, fuel and air filter, oil change, some one suggested checking the cat, can I remove it completely without disrupting a sensor or something else, I live in Florida and there are no inspections so I can do away with it, I have no faults or idiot lights on and no gas smell but does smoke when I hit the accelerator to take off quick- also cleaned outside of throttle body (didn't take apart) also ran 6 tanks of marvey mystery oil

SOURCE: 1993 Buick Century Custom 3.3L Runs Rich, Ruff at idle; 10MPG

Check the fuel filter, it might be clogged.

SOURCE: buick regal 92 3.8L Horrible fuel mileage

Sounds like you might have an oxygen sensor problem. Your catalytic converter(s) maybe defective or dirty. That in turn can dirty up the oxygen sensor. A defective oxygen sensor will send faulty info to the computer, interpreting the fumes as cold (even when the engine warms up). That causes the computer to adjust the fuel mixture to very rich, giving you poor gas mileage and the fuel smell. Hope it helps.

SOURCE: 1990 Buick Regal 3.1 has rough idle, hesitates and dies when accelerating.

A lot of new parts! Have a compression test done to gauge the engine's internal condition, and go from there. If compression is good on all 6 cylinders, scan for trouble codes. The compression test may find your problem, something like an exhaust valve burned or not seating properly.