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Worse mileage?

H

Howard

Lifer
What could the possible causes be? The air pressure in my tires is generally OK and the engine oil isn't due to be replaced yet. The transmission was flushed recently. The weather is getting a bit colder.
 
Well, one quick and easy explaination is that the gas stations in your area just switched to their winter blend. People usually get worse mileage on that.

Other possibilities include a vacuum leak, clogged or leaking air intake, partly clogged fuel system (filter or injectors), fouled plugs, timing issues (unlikely on modern cars)...

Have you noticed any other symptoms, like a loss of power, a change in how hot the engine runs, a change in the noise of the engine at any RPM or engine load...?
 
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