LS - 1st and 2nd Gen (1990-2000) Discussion topics related to the 1990 - 2000 Lexus LS400

mpg diagnosis

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Old 10-02-07, 03:55 PM
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Ls4hundred
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Default mpg diagnosis

I live in North Carolina drive about two miles to and from, in city driving and am getting 9-12 mpg. I was getting 12mpg with a horrendously dirty air filter, changed it, and now I'm getting 9 mpg. Is there a problem? I don't have a lead foot, or at least I don't think so.
Old 10-02-07, 05:01 PM
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Thermactor
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That's about ballpark for a two mile city driving trip. Unfortunately the car consumes about twice as much fuel when cold, as it does when fully warmed up. And 9-10mpg is what I get on a very short trip as well. Best advice is to check for trouble codes and keep your foot out of it
Old 10-02-07, 06:38 PM
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sonyman
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I never get that little, nor should anyone unless they are flogging the car. Something is amiss.
Old 10-02-07, 07:16 PM
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Ls4hundred
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I'm not flogging the car I drive it to and from school doing no more than 35mph.
Old 10-02-07, 07:49 PM
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Suneet
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How long has it been since you replaced your ignition coils? I had a fauly ignition coil, replaced my plugs, wires, caps, rotors, coils, and I had much more power and much better gas mileage afterwards. You should get closer to 15 mpg.
Old 10-02-07, 10:30 PM
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What kind of fuel are you using?

If you are running regular, it could be contributing.
Old 10-08-07, 12:22 PM
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Ls4hundred
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sorry for not responding quickly my internet was down. I don't know how long it has been since I changed the cap because I just bought the car about a month ago. I am using regular but 9 mpg just seems excessive.
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