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Old 11-05-2011, 08:55 AM   #1 (permalink)
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Default 95 3000gt getting 12 Mpg! Normal?

I bought my 95 3000gt in orlando. I live in miami. On the drive here the car did around 22-23 mpg all highway which isnt bad. Since then I have only driven it city and it gets like 11-12 mpg. Is this normal? Im new to 3000gt's is there anything that I can do to improve the gas mileage? I only use premium like the manufacturer suggests.

By the way I dont know if it helps, but it is an SL with a TT motor swap
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Old 11-05-2011, 09:08 AM   #2 (permalink)
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Default Re: 95 3000gt getting 12 Mpg! Normal?

You may have a bad 02 sensor. Do you have anything to log with. What do your fuel trims look like?


Interesting and in for any suggestions. Mine has never gotten the mileage I hear others talk about but lately it's dropped to the 12-13 range in city. Still gets 20 or better on the highway. Fuel trims good. O2's new. AFRS look good on the wb. No fuel leaks that I can find.
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Old 11-05-2011, 09:39 AM   #3 (permalink)
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Default Re: 95 3000gt getting 12 Mpg! Normal?

no that's not normal, something has gone awry, get the 02 sensor checked, and keep trouble shooting from there into ignition, ptu, plugs, if that wasn't it

these cars are not bad on gas, even with 550cc injectors I still get close to 400mi per tank
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Old 11-05-2011, 10:13 AM   #4 (permalink)
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Default Re: 95 3000gt getting 12 Mpg! Normal?

It depends how you drive, if you boost frequently while driving in the city, 12-13 is probably normal.
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Old 11-05-2011, 10:51 AM   #5 (permalink)
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Default Re: 95 3000gt getting 12 Mpg! Normal?

Well I just did a boost leak test and found out that my BOV leaks pretty bad. Would that cause a decrease in mpg. I also turned the idle RPM's down to around 800-900. The PO had it up to 1500 at idle. That should help slightly. I am also having trouble finding a shop in south florida that has the right computer to diagnose a OBDI system. It seems that all they all only have OBDII scan computers. I do have a narrow band AFR gauge (I know its not much accurate compared to a wideband) it is lean at idle and within the normal range while driving and at cruise. It never goes to the rich side of the gauge, even under boost. I will keep posting as I make adjustments. Hope I can find the problem soon!
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Old 11-06-2011, 11:45 PM   #6 (permalink)
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Default Re: 95 3000gt getting 12 Mpg! Normal?

I drive a non turbo

I'm getting 21 - 22 in LA sitting in traffic for half the tank and mixed city / highway the rest of the time. Highway I get 27 + no problem.
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Old 11-07-2011, 05:36 AM   #7 (permalink)
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Default Re: 95 3000gt getting 12 Mpg! Normal?

Seems normal to me. Then again I can't keep my foot from pressing the gas pedal all the way down.

Boost leaks will do it.
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Old 11-07-2011, 12:51 PM   #8 (permalink)
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Default Re: 95 3000gt getting 12 Mpg! Normal?

It's odd that o2 wideband hasn't seemed to change yet the mpgs have died.

I only ever drive my cars on country roads or stop and go highways with lots of red lights, (of which are always flipping red..) and I get 27mpg out of my na and 24mpg out of my tt
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