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Bad GS400 Gas Mileage

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Old 09-15-14, 09:21 AM   #1
tlts82
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Default Bad GS400 Gas Mileage

I'm getting about 100 Miles to half a tank of gas. I've got a new MAF, O2's all 4, ECT, New Fuel Pump, Regulator, Filter, Strainer. New OEM Plugs. No Cel Light

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Custom Borla Exhaust W/ Xpipe 2.25 piping and 2 new Cats.
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Old 09-15-14, 09:49 AM   #2
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that sounds almost avg for city/surface streets driving.
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Old 09-15-14, 10:20 AM   #3
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thats about the same for my gs4 in city driving..
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Old 09-15-14, 10:41 AM   #4
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thats normal bro, dont feel too bad, be happy your not in NYC, with my 430 I get about 150-180 miles per tank with just city driving. If I mix some highway in there ill be lucky to get 200. If I idle alot I get even less then 150. this car was definitely NOT built to sip gas, when it came out gas was only like $1.50 a gallon so imagine. MAN DO I MISS THOSE PRE 9/11 GAS PRICE DAYS before the oil company crooks took control of the middle east and started milking us for every cent on gas prices!
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Old 09-15-14, 10:41 AM   #5
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Has any of you guys had a issue with the fuel gauge? Once I ran out of gas at about 1/4 tank left. So basically for the last year I've been filling up before if hits the 1/4 mark.
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Old 09-15-14, 01:23 PM   #6
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i get 340 avg on my 99 gs4, i have a k&n intake, blitz nur spec exhaust, no resonators and i drive normally and at times give her gas
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Old 09-15-14, 01:30 PM   #7
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Make sure that the right fuel pump is in the vehicle.

I have a 98 gs400. I get about 200 at the half mark.
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Old 09-15-14, 04:02 PM   #8
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Also depends on your rims and tires. For example: the wider the tires the worse gas mileage you will get because there is more drag. Also, could be that x pipe your running as it ruins the low end torque in our cars. As said earlier make sure you have the right fuel pump in the car. You can also try seafoaming the car.
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Old 09-15-14, 04:16 PM   #9
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Quote:
Originally Posted by 99GS400HP View Post
i get 340 avg on my 99 gs4, i have a k&n intake, blitz nur spec exhaust, no resonators and i drive normally and at times give her gas
All you lucky bastards not living in NYC where city driving consists of stopping every 10 seconds at a stop sign or light. I'm so jealous of that MPG my wallet is drooling
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Old 09-15-14, 09:32 PM   #10
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Quote:
Originally Posted by GSTim View Post
Make sure that the right fuel pump is in the vehicle.

I have a 98 gs400. I get about 200 at the half mark.
Impossible!!! Not calling you a liar but thats hard to believe...
i get 240 per tank 60% freeway and A/C on about 80% of the time. also where do you live? am from UTAH
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Old 09-15-14, 09:38 PM   #11
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i usually get about 140 miles when needle hits the halfway mark and 240 when the gas light comes on. Averaging about 14.1 MPG. I am mostly city, and some highway.
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Old 09-15-14, 10:40 PM   #12
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I can get 400 miles to a tank all highway driving
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Old 09-15-14, 11:53 PM   #13
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Does anybody calculate mpg the old fashioned way, by dividing miles driven per gallon used anymore? This deal of I drove 200 miles with unknown amount of fuel used is as inaccurate as uncle Miltie's Pawn Shop's accounting (fictitious name but you get the idea).
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Old 09-16-14, 12:23 AM   #14
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Quote:
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I can get 400 miles to a tank all highway driving
ive had close to 400 miles on freeway driving! i wish i can get that much on city+highway and still push 300 hp...
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Old 09-16-14, 04:28 AM   #15
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How does an x pipe ruin torque?
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99 GS400, trpl blk
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Old 09-16-14, 04:28 AM
 
 
 
 
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