Is it possible for a vacuum leak to cause really bad gas mileage?
I already know my cruise probably doesn't work due to a vacuum leak. But I'm all the sudden getting really crappy mileage (like south of 16 mpg in town) after averaging a decent mileage in town (22-23).
I haven't checked the plugs yet, but it's a fresh oil change and tires are properly inflated and I have a new air filter.
I always hear a strong hiss (coming from what I believe is the cruise control pump or whatever it's called, under the battery), but just haven't done anything about it.
Also, what size hose is it?
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1985 245. 246K Gone..but not forgotten.
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