Thread: Gas Mileage

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  1. #1 Re: Gas Mileage 
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    Quote Originally Posted by Remnant King View Post
    I DID have a Check Engine Light, but that was the valve, which I replaced. How would I know if its a shot o2 sensor or vacuum leak?

    Not sure if it's the exhaust, but there's a lot of loud and weird noises D:

    I changed the fuel filter, and the pump IS making noise. Havent really looked into the lines for leaks, neither the o2 sensor. How would I check if the cat is clogged? I rarely ever heavy foot it unless I need to, and there's no way I heavy footing it as much as where it drops down THAT much. I go into the car this morning to warm it up. What started at 13 mpg, ended at 3.1 mpg by the time the car was done warming up...D:
    Of course your MPG isn't good your sitting still. Also check your tire pressure.
    99 GTP, ZZP MPS 2.9 pulley, GenIII supercharger ported & polished, machined intake W/ stage 2 intercooler, XP Cam,ZZP fuel rails, 42.5 injectors, Wizard CAI, custom headers, 3 inch downpipe, into dynomax muffler,180 stat, Northstar TB, 85mm MAF, ZZP trans, 3.29 gears, input shaft and torque converter, stock heads W/Ls6 springs.
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  2. #2 Re: Gas Mileage 
    Donating Users danielle15's Avatar
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    Just my 2 cents...try resesting the dic? I know mine was awful low and not matching what i was hard figuring until I reset it and now its better. So maybe it just hasnt been reset for a long time?
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  3. #3 Re: Gas Mileage 
    GT Level Member Remnant King's Avatar
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    Thanks for the suggestion, but I've reset it almost every time I would pump gas.
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  4. #4 Re: Gas Mileage 
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    Quote Originally Posted by BlackSun View Post

    I go into the car this morning to warm it up. What started at 13 mpg, ended at 3.1 mpg by the time the car was done warming up...D:

    Of course your MPG isn't good your sitting still. Also check your tire pressure.

    What he said. How far had you driven it to get the 13 mpg? These don't have an 'actual' mpg, it is averaged. If you filled up and then went home and parked it and ended up there with 13 then of course you only had 3 after sitting there warming up. You are using gas and going nowhere, so your mpg's while warming up are zero. It only needs 10-15 seconds of warming up on a cold day before you can drive it (carefully until it reaches operating temp).

    As mentioned, you need to check how many gallons it took you to drive the miles you got out of that tank. If you do a lot of excess idling and warming up and only drive around town you will never get good mileage. My DIC usually shows about 30, but I drive 99% of the time on the highway, and even then I find it to be about 5-10% optimistic.
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  5. #5 Re: Gas Mileage 
    GT Level Member Remnant King's Avatar
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    Quote Originally Posted by 40th GP View Post
    What he said. How far had you driven it to get the 13 mpg? These don't have an 'actual' mpg, it is averaged. If you filled up and then went home and parked it and ended up there with 13 then of course you only had 3 after sitting there warming up. You are using gas and going nowhere, so your mpg's while warming up are zero. It only needs 10-15 seconds of warming up on a cold day before you can drive it (carefully until it reaches operating temp).

    As mentioned, you need to check how many gallons it took you to drive the miles you got out of that tank. If you do a lot of excess idling and warming up and only drive around town you will never get good mileage. My DIC usually shows about 30, but I drive 99% of the time on the highway, and even then I find it to be about 5-10% optimistic.
    That honestly really helps, I always give the car 5-10 mins of warming up only because literally EVERYONE says you have to wait until the temperature hits like 180 before driving -__-

    I changed out the plugs and wires about a month ago so I doubt that could be the problem.

    Other than that, I'll just have to calculate it myself and see what I get. Thanks a lot to every one of you for the help, I really appreciate it.
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  6. #6 Re: Gas Mileage 
    GTX Level Member J GTP's Avatar
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    Quote Originally Posted by Remnant King View Post
    I always give the car 5-10 mins of warming up only because literally EVERYONE says you have to wait until the temperature hits like 180 before driving -__-
    That's ideal, but I bet 95% of people don't do that. Typically, unless it's really cold, I give my car about 2-3 minutes, then just take it easy until it warms up to where I can see it's 160 or better.
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  7. #7 Re: Gas Mileage 
    GT Level Member 40th GP's Avatar
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    Quote Originally Posted by Remnant King View Post
    That honestly really helps, I always give the car 5-10 mins of warming up only because literally EVERYONE says you have to wait until the temperature hits like 180 before driving.
    That's your problem. If you are doing that and you drive mostly around town you will probably never get more than about 15 mpg at best. You only need 10-15 seconds of warming up to get fluids cirulated and oil up to the top of the engine, then just drive it easy until fully warmed up.
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