Carburetors Carb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.

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Old Apr 2, 2002 | 12:17 AM
  #1  
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From: Canada
Post your Milage

For those of you that use your car as a daily driver, what kind of milage are you getting with your setup?

Will
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Old Apr 2, 2002 | 01:56 PM
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Brian Felts's Avatar
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From: Chillicothe Ohio
Car: 89 RS 355/ 89 IROC Convert
Engine: Hot Cam 355/TPI 305
Transmission: All 700r4's
My sig with 770 Street Avenger running Rich I am getting 19 mpg when I get the jets right I think I will run about 22mpg...........Thats with a 350 3.73 gears.


Brian
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Old Apr 2, 2002 | 04:05 PM
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I only get 13 mpg on the interstate. What's goin on the guy above said he got 22 with his 89 350. Mine is a little souped up, but *** that is a big difference. Oh well, my mods are in my sig. Is that 89 posted above a carb or fuel injected.
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Old Apr 2, 2002 | 05:49 PM
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From: Chillicothe Ohio
Car: 89 RS 355/ 89 IROC Convert
Engine: Hot Cam 355/TPI 305
Transmission: All 700r4's
They only way I may be doing better than jfox55 is that when I did mine I made an effort for that tank of gas to stay out of in unitl I filled up again..........now let me tell you a few launches and I would have gotten 13 also.



Brian
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Old Apr 2, 2002 | 06:16 PM
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like I said, that is on the interstate. I might push 14 out of it. Around town and back and fourth from work it is closer to 10-11. But I have a big problem behaving myself. Those flowmasters just sound too good to keep em quiet. And since this is my first camaro, and also my first v8 you can just imagine, all my other cars have had 4 cyl engines. So I figured I would do my first v8 right. This thing is pretty mean.:rockon: :rockon: :rockon: :rockon: :rockon: :rockon: :rockon: :rockon:
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Old Apr 2, 2002 | 06:33 PM
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From: Corona
Car: 92 Form, 91 Z28, 89 GTA, 86 Z28
Engine: BP383 vortech, BP383, 5.7 TPI, LG4
Transmission: 4L60e, 700R4, 700R4..
Axle/Gears: 3.27, 2.73
That cam and gear can't be helping mileage too much. Oh, my car gets bad mileage too, but it's on its last leg, or toes.
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Old Apr 2, 2002 | 06:40 PM
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I know it's hard on gas. BUt Man do I love the power. She's a beast!!!!!!!!:rockon: :rockon: :rockon: :rockon: :rockon: :rockon: :rockon:
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Old Apr 2, 2002 | 06:42 PM
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My engine actually has less than 8,000 on it. The engine and tranny actually. Along with the new polygraphite suspension. It's definately not on its last leg, just a gas drinkin machine.
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Old Apr 2, 2002 | 06:49 PM
  #9  
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From: NE
Car: 82 camaro SC
Engine: 350
Transmission: 700r4
Around 18 mpg. But it's more of a weekly driver
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Old Apr 2, 2002 | 08:57 PM
  #10  
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From: Rust Belt, WI
Totally stock 350 tpi engine, except for a Holley 750.
12-15 mpg. ahhhh!

I need to do -just a wee bit- of tuning. :P
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Old Apr 6, 2002 | 04:46 PM
  #11  
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From: kingfisher, ok
19 with the 2.73's an 16 with the 3.73's. It appears that my engine is very efficient except when it is floored all the time then milage is about 10.
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Old Apr 7, 2002 | 08:52 PM
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From: Euclid, Ohio
I get around 17 MPG around town and about 25 MPG on the highway with my 87 IROC 305 four barrel automatic with 2.73 gears.
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Old Apr 8, 2002 | 12:50 PM
  #13  
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From: milwaukee, WI
my 84 berlinetta just got a personal best 18-19 combined city/highway. It's auto with 3.08s and 192, 000 all original stuff, except the rear i think.
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Old Apr 8, 2002 | 01:55 PM
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From: central florida
Car: 89 Formula
Engine: 305
Transmission: 700r4
Axle/Gears: 3.73
Mine will get about 18 around town and about 20 on the freeway. But just like jfox55 ive got the flowmasters too so it is kinda hard now-a-days to get the best mileage
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Old Apr 8, 2002 | 11:47 PM
  #15  
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From: Tx
Car: 92 Z, 91 Formula, 04 CTS, 01 Tahoe
Engine: 355 forged 4 bolt, SuperRam, 58mm t
Transmission: T5, looking for t-56
10-12 highway with mods in my sig.Cam is 242/242 duration and .501"/.501" @ .050

Last edited by RSpeed; Apr 11, 2002 at 07:51 PM.
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Old Apr 9, 2002 | 04:01 PM
  #16  
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From: Richmond, VA
Not too sure about around town, but get about 23 mpg on the interstate with my current setup, using the "black" secondary spring for the Holley. If ya don't want to check out the website, it's a Goodwrench 350, Performer RPM intake, Holley 600 cfm, and TES headers. stock T5 too.
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Old Apr 10, 2002 | 12:47 PM
  #17  
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From: fairborn, ohio
not good...probably about 7 or 8 mpg but at least it runs on the cheap stuff. 9.5:1 compression
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Old Apr 11, 2002 | 08:35 AM
  #18  
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From: Seneca, SC
Car: '86 Z-28
Engine: 355
Transmission: T5
I'm getting 22mpg on average and drive around 120 miles a day between work and school.
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Old Apr 12, 2002 | 12:54 PM
  #19  
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From: Philly, PA
My blown 383 QJet-equipped Malibu gets about 17 on the highway with no overdrive, no lockup converter and 2.92 rear gears. It's jetted a smidge rich and the ignition advance curve likewise is tuned more for power than economy.

My brother's dead stock 85 LG-4 Z-28 (with computer controlled QJet) knocks down 25MPGs on the interstate with overdrive manual trans and 3.23 rear gears. Best I ever heard of for a daily driven carbureted small block V-8.

Now the sick stuff..............

His 87 GTA with Miniram-injected 409 small block, 700R4 OD automatic trans and 3.27 rear gears gets 22 on the highway!

My dead stock 94 Formula with 350 LT-1 engine, 6 speed manual trans and 3.42 rear gears gets a REAL 27 MPGs!!!!! Of course, around town it's more like 12, but on the highway it's unreal how good the mileage is.
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Old Apr 12, 2002 | 02:23 PM
  #20  
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From: Calgary, Alberta, Republic of Western Canada
Car: 1986 Sport Coupé
Engine: 305-4v
Transmission: 700R4 and TransGo2
Well ...

Around town I get 17 to 18 mpg, in American gallons. In Canadian gallons it would be around 22 or so.

On the highway I'm guessing it is round 25 to 27 mpg, again in American gallons.

Nothing like a well tuned 305 with headers, 2.73 gears and a 700r4
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Old Apr 13, 2002 | 02:01 AM
  #21  
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From: LaFayette, NY
Car: '10 Subaru Forester
Engine: 2.5 Boxer
Transmission: 4EAT
Axle/Gears: 4.44
about 14.5 on weekends when I really put the rubber down... usually about 17 on weekdays (80% highway drivin') On really long trips I have seen 20 MPG, but I gotta be tryin' real hard.
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Old Apr 28, 2002 | 09:33 AM
  #22  
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From: Charleston, SC
Car: 1988 Pontiac Firebird, flat black
Engine: Stock 305 LO3
Transmission: Five speed
My other car has a holley with a weind (sp) x-celarater and a holley 750 on a 350. I get about 13-15 on highway. 3 speed tranny with 3.08 gears. Qjet and dual plane intake, highway have hit 20, but was going about 10mph slower.
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Old Apr 28, 2002 | 02:53 PM
  #23  
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From: St Catharines, ON
Car: '85 Z28
Engine: 350
Transmission: T5
Axle/Gears: 3.23
canadian gallons?? I guess that means litres
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Old Apr 28, 2002 | 10:23 PM
  #24  
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From: Calgary, Alberta, Republic of Western Canada
Car: 1986 Sport Coupé
Engine: 305-4v
Transmission: 700R4 and TransGo2
Originally posted by 85_ZED28
canadian gallons?? I guess that means litres
No, a Canadian gallon is equal to 1.2 US gallons :nono:

It is equal to an "Imperial Gallon," as the British used.

(A liter is .95 of a US quart.)

So, if I'm getting 18 mpg US around town, that would equal 21.6 mpg in Canadian gallons.
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Old Apr 30, 2002 | 06:04 AM
  #25  
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Getting 25 mpg on the freeway with my foot out of it. This is with 3.23 gears crusing around 2500 rpm. Yeah... I was amazed too. Got #69 jets in my Holley 750.
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Old Jul 13, 2002 | 06:51 PM
  #26  
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From: Roswell, Georgia
I have been getting 16mpg with the freshly bolted on Holley 750 Vacuum Secondary. Just changed the jets this morning we'll see how the numbers improve.
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Old Jul 13, 2002 | 08:58 PM
  #27  
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From: Cathlamet, Washington
Car: 87 Formula
Engine: 327
Transmission: 700r4
Axle/Gears: 3.23
After changing the gears to 3.23s, I filled up and of course tested them a bit! Then drove about 150miles freeway. Ended up with 18mpg and thats without overdrive! One of the reasons I've always liked 327s.
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Old Jul 13, 2002 | 11:52 PM
  #28  
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Originally posted by Sitting Bull
(A liter is .95 of a US quart.)
Other way around...

Oh, I get around 16-18 mp(US)g commuting.
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Old Jul 15, 2002 | 07:55 AM
  #29  
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From: Cincinnati, OH, USA
16 mpg on the highway is my best.
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