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Q:

My 95 Pontiac Bonneville Is sucking gas way too fast on 1995 Pontiac Bonneville

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It is like 3 mpg
(1) Answer
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3 MPG is horrible. The engine coolant temperature switch may be reporting the engine is stone cold, making the computer add fuel all the time, a fuel pressure regulator may be leaking, fuel injector may be leaking, air filter restricted, perhaps a mouse has built a nest in the air filter housing restricting air into the engine. It shouldn't be hard to make improvements. 3 MPG will quickly kill the catalytic converter.