LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Why is my mpg so bad?

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Old Jul 3, 2006 | 01:35 AM
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Default Why is my mpg so bad?

First off i know a lt1 t/a isnt what you want if you worry about mpg but it is my dd and dont want to fill up 2x a week for $100+. My car is a 93 lt1 auto t/a 3.23's. Now before my full exhaust (Lt's, ORY, CB.) i was at about 220-230 a tank. Now im at about 180-190 and going done with each tank I had all new spark plugs wires in with it to. BTW i have a light foot and rarely gun it around town. Almost all city. I tried seafoam, didn't seem to do much but i only did it in the gas tank though. My car idles fine around 600 rpms and car drives fine to. What could my problem be?? and what should i do.
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Old Jul 3, 2006 | 03:19 AM
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if that's almost all city that is around 12.5 mpg. That's not really too bad for city mileage with headers + cutout + other mods.

I would say get a cheap honda for better mpg if it gets too expensive. I doubt there is really anything wrong with your car.
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Old Jul 3, 2006 | 08:18 AM
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Well somethin's up with his, cause I have mine with 3.73's, and I am coming close to 200 miles a tank, and that is getting on a little more than often. I am putting LT's on it soon. Could be that you have bad O2 Sensors, making it run rich.
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Old Jul 3, 2006 | 12:18 PM
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i had the work done at a good shop and i have a tune how would i know for sure on the 02's?
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Old Jul 3, 2006 | 12:19 PM
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btw i dont run it with the cutout if at all but i read about people get 300 to 350 plus with more mods and heavy driving so there has to be a way
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Old Jul 3, 2006 | 12:51 PM
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I've got about the same set up as you, but I haven't installed my headers yet. 94z.. my 2nd gear and 4th are out though, and I still get about 180, or 15mpg. According to my gauge I'm running slightly rich.
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Old Jul 3, 2006 | 01:09 PM
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hmmmm that is pretty odd but I agree that if that is all city driving, that isnt too bad considering stop and go driving. I have 3.73s and a 3200 stall and a lot of other bolt-on mods and I'm always getting over 200 to the tank but mine isn't all city driving.

But one thing is for sure, I ******* hate our gas gauges cause it'll say full - 3/4 tank and then once you get around 150 miles it drops so dam quickly lol. Thats why I always go on the milage.
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Old Jul 3, 2006 | 01:26 PM
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Yea, you aren't lyin...
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Old Jul 3, 2006 | 02:06 PM
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But one thing is for sure, I ******* hate our gas gauges cause it'll say full - 3/4 tank and then once you get around 150 miles it drops so dam quickly lol. Thats why I always go on the milage.[/QUOTE]




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Old Jul 3, 2006 | 02:29 PM
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yeah i really hate that when i first had the car i ran out of gas a few times i would literally roll into gas stations oh and my city driving isnt like stop go stop go its just short trips around town or cruisin around is there anything i can do to help out tune up some tricks or something i have to fix it a little
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Old Jul 3, 2006 | 05:09 PM
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I do alot of city and highway driving and get about 280 out of a tank. And i'm definatally not drivin slow. Gotta love the go pedal.
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Old Jul 3, 2006 | 05:17 PM
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Originally Posted by Kanes2413
btw i dont run it with the cutout if at all but i read about people get 300 to 350 plus with more mods and heavy driving so there has to be a way
I don't know anyone that gets 300-350 all city.
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Old Jul 3, 2006 | 06:23 PM
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it was a in thread about a month ago i couldnt believe it but they were saying it
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Old Jul 3, 2006 | 06:29 PM
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I used to get 300+ mostly highway with M6 but damn!
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Old Jul 4, 2006 | 05:24 PM
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I went from 11-13 babying it, to 16 slapping it around like a toothless ***** after seafoaming


Six Speed Too
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Old Jul 4, 2006 | 06:19 PM
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try a fuel filter, even with my heavy mods I got 32MPG on the way to g10 and 30 ont the way back.
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Old Jul 4, 2006 | 07:15 PM
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its a 93 with LT's... have you done the heated O2 conversion yet???
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Old Jul 4, 2006 | 10:12 PM
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not to be a noob but i dont know about that what is it
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Old Jul 4, 2006 | 11:14 PM
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shoot me an email..i have pics and diagrams specifically for a 93... i own one so i would know..
email me at harvickgm@yahoo.com
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Old Jul 5, 2006 | 12:12 AM
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When my torque converter went bad I was getting 10mpg.
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