I seem to be getting around 200 miles per tank. i have a 89 RS LO3, automatic. shouldn't i bet getting more. this is like 12.5 MPG. do i have a 16 gallon tank?? 200/16 = 12.5

 

Yes you should be getting lots better MPG, I avg.19-21 MPG with my car, about 290-310 miles to a tank (15.5 gal.)and I have gotten 30 MPG during straight hwy. driving. Make sure your car is tuned up and replace your O2 senser if it has over 80,000 miles on it, thats when mine went out and my mileage dropped to about 14 MPG.

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92 Camaro RS 5.0 5-Speed (Quasar Blue)
T-Tops
14" Open Air Cleaner
3.08 Posi-trac
Edelbrock TBI Intake
Crane cam
Ported & polished stock heads 3 angle valve job
HyperTech Chip
UltraFlo cat-back exhaust

74 Dodge Dart Sport 360 (11.2 1/4 mile)

2000 Dodge 1500 Ram Sport

 

I usually put about 11 gals. of gas in the tank when i fill it up, and get about 210 miles to tank. Probably more than that now, since i put in a new 02 sensor tuesday, but too soon to really tell i guess.

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88 Camaro (The mighty LO3 SC!)
305TBI/700R4/2.73/125,XXX miles
10" Open Element and Flowmaster 80 seires
Bosch Platinum plugs
Double silicone Accel wires


Next up: headers and gears

 

is there a performance O2 sensor or do i just go to kragen and ask for one

 

before i put my new engine in, i got about 14-15 mpg. you dont even want to know what i get now...

-brian

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1991 Camaro RS
GMPP 350 HO crate engine - 454 TBI, MSD ignition, SLP exhaust, everything is new
700R4 - 2,400 stall converter, vette servo, shift kit
My car's webpage - z28boy.cz28.com
President - Central New York F-Body Association
Email - z28boy@twcny.rr.com
AIM - "Z28 Boy"

 

I've been getting 200-230 miles per tank so I bought a new O2 sensor but I cant find where the friggin thing goes! I know it goes into the passenger's side manifold but nothing there remotely resembles the O2 sensor I bought! Is it hard to get to/replace in the driveway? Where exactly is it? HELP!

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91 Camaro RS - Black with red tweed - t-tops - 700 watt sound system - 14x3 open element - 80 Series Flowmaster - muffler turndowns - Poly transmission mount- BeCool radiator-
Coming soon: 4th gen rearend and chrome 10 spoke SS wheels

88 TransAm GTA - WS6 - red with grey cloth - K&N Filters - TPIS Airfoil - Wonder Bar - Future Restoration

 

on mine it was on the drivers side header, im not exactky sure where it is, put it should be the only thing sticking out of your header that has a wire attached to it, it something you can do in your driveway, i just replaced mine today, and i notices a mpg change, in my favor

yeah tell me about it, before i changed my o2 sensor today i think iwas getting like 6 mpg or something like that, my take went down a little less then a quarter on a 16 mile trip

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90 RS 305 tbi, 4 3/4" cowl Hood, Edelbrock TES headers, Flowmaster exhaust, Crane roller cam, comp roller rockers, vortec heads/intake, ported tbi, w/new injectors, MSD probillet Distributer/ coil, 1 inch tbi spacer, air foil, 14x4 k&n flat base air cleaner, Rebuilt 700r4 w/ B&M shift kit, B&M Megashifter, 3.23 posi, 2 12 RF's with mtx amp, top of line alpine cd player,autometer phantom gauges, soon to have 91-92 gfx, z-28 wing, new paintjob, rims, all new suspension, and new inteior

 

O2 senser is on the driver side, just under the exhaust manifold.

 

My 355, 13 sec, Xfired, TBI'd FBird, got 25 highway (at 55 or 75). I don't count in town use as a measure of what mileage your getting, since it's of function of stop light spacing.

 

My Haynes manual must be wrong them cause I swear it said it's on the passenger's side! Well, I'll look tomorrow. Thanks

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91 Camaro RS - Black with red tweed - t-tops - 700 watt sound system - 14x3 open element - 80 Series Flowmaster - muffler turndowns - Poly transmission mount- BeCool radiator-
Coming soon: 4th gen rearend and chrome 10 spoke SS wheels

88 TransAm GTA - WS6 - red with grey cloth - K&N Filters - TPIS Airfoil - Wonder Bar - Future Restoration

 

i've pretty much always got 17-22 mpg, since my mods i get at least 19 even with hard driving, I get 25 on the freeway.

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late model 91 rs, fully loaded, auto, t-tops, red leather, paint- gm red and yellow blend (light red), custom painted 16" Camaro rims
305 tbi flat base 14"x3" with K&N, hypertech chip, accel super stock plug wires, only use full synthetic oil and delco filter, 2 1/2" cat delete pipe, Edelbrock 3" cat-back
MTX sub and amp, Bose all around
vic_v8@yahoo.com
street kills: New v-6 stang, 96 v6 camaro, totally killed '86 SC Camaro (305), 91 z 28 with 305
15.854@87.57 (I think I could have it 15.5 with good tires and two more runs)
next month: rest of ultimate tbi

 

You're doing the math wrong... your tank isn't completely empty when it hits the E You've probably got 5 gallons left at that moment. Look at how many gallons you have to put in to top off your tank and use that as the number of gallons, not the 16 your tank can hold. So say 11 gallons are needed to fill up... 200/11 = 18.1 MPG which is pretty typical of city driving.

AND just so nobody starts this debate again, all sources point to gas tanks ranging from 15.5-16.5 gallons, any other numbers that get thrown around are just BS.

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1984 Firebird - Daily driver, 305 LG4, 3.23 rear, T5 - Hurst short shifter, Edelbrock 600 CFM 1406 carb, Performer intake - Edelbrock Pro-Flow air filter, gutted cat, IROC 16x8 5 Spoke Wheels, AIWA bargain basement (from Sears of course) CD player, Eight-ball shift ****
Check out my ride here

"IT'S SNOWING! TO THE HIGH SCHOOL PARKING LOT!" - The Mustang and Firebird face off in the dead of winter.

 

Man, I guess I better change mine too. My 305 TBI only has 52k but the BEST gas mileage that I have gotten was 208 with premium of course. Could my sensor be out this early? Because this weekly gas trip with premium is getting costly.




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1991 Pontiac Firebird
52k Miles
T-Tops
Fire Engine Red
305 TBI
14" Edelbrock Element
"Pure Crempuff"

 

I guess ill go and buy a O2 sensor and change it. and ill calculate the gas mileage the right way next time. thanks for all your help

 

My Caprice got 20.1mph once. That trip was like 95% highway driving. Of course, my car is a little heavier too. But it did get a bigger (23gallon) gas tank

Hmm 101k miles on the clock. Looks like it's time for a new O2 sensor.

Would members of this board recommend sticking with ACDelco or maybe trying another brand?

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Cheston Phillips
'96 BBB Impala SS "ADIOSS" & '91 white Caprice 'n0n 9c1' w/L03
GM_TBI list

 

My TBI 305 92 RS got about the same 200 miles per tankful also.Maybe it's my right foot, but I haven't gotten much better than that around town.Still, it'll do 300 miles on a tank if it's all freeway travel and I'm doing 85-90 mph.This with 3.08 gears and T5 trans.
-Rich-

 

I usually put about 240-250 miles on a tank and I usually have about 1.5-2 gallons left when I tank up.

 

I have an 89 RS with the 305 L03, and i get about 10.7mpg, and when I don't rod around I get about 14 mpg. The most miles I've had on it were about 170 on one tank. I've allready spent about $600 in trying to fix it and get some power out of the engine, but I can't get nothin out of it.... I guess I'm going to have to rebuild the engine.

 

How are you doing that after about 10 gallons my car will stall on turns and braking.



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Brady
"I see myself as a huge fiery comet, a shooting star. Everyone stops, points up and gasps "Oh look at that!" Then- whoosh, and I'm gone...and they'll never see anything like it ever again... and they won't be able to forget me- ever."~Jim Morrison

 

Well mine gets 19-22 mpg. I've went as far as 270 on a tank of gas. And I'm calculating my mileage the right way(miles driven/gallons to fill up).

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1989 Pontiac Firebird Formula LO3/700R4
-180 degree stat, Hooker Cat-Back, Wonder Bar

http://www.geocities.com/krt80/

 

I average 22-23 in overall driving. I've seen as high as 29+ on a straight highway run,75 on cruise. It seems like 290 to 325 per tank. It may be time to look at the O2 sensor if the rest of you are having probs at the 80k mark I'm way past that.

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'92 firebird t-tops
305tbi,670cfm tbi, 2 1/2" Dynomax catback, 9x3 K&N open element

 

brodyscamaro, I'm actually making a little better gas mileage than what I posted. It's more like 2.5-3 gallons left now. Not really sure why but I'm not complaining.

My car is a 91' Firebird and as far as I know the tank is baffled so it doesn't have that stalling problem, like earlier model f-bodies did. The most gas I've ever put in my car was right around 14.3 gallons or somewhere around there. I could make turns and brake without any problems.

 

I have a 1992, but it has an older camaro's tank. I replaced my O2 sensor and air filter and I STILL get 9.5 mpg. About half the time it runs good and the other haly my car will bog and run really rich why

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1992 Camaro RS LO3 auto
180ş thermostat, 14×3 K&N, Ultimate TBI Mods, !Cat, !Smog pump Flowmaster 80 series, and some audio stuff.

 

so none of you computer guros know why half the time it runs good the other haly it runs rich?

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1992 Camaro RS LO3 auto
180ş thermostat, 14×3 K&N, Ultimate TBI Mods, !Cat, !Smog pump Flowmaster 80 series, and some audio stuff.

 

I have no idea about that one. Have you ever checked out your fuel pressure to see what it's doing? Are all your sensors working correctly. Sometimes the computer is funny about certain sensors like that and will result in horrible gas mileage.

 

thanks how would i go about checking all of that

 

Brody,
I think if you got that gas tank from a junk yard, there is a good chance your baffle is broken inside. That is what is supposed to keep the gas from sloshing around on turns. When you run the tank low you might start sucking air into the lines because the gas sloshed to the other side of the tank. Do you hear any kind of "clunking" inside the tank when you drive with less then a quarter tank? I get 325 miles per tank in mine, and I run her till she's dry- I've coasted into the gas station more then once! - Randy

 

92RS, he said that his tank is from an older model camaro so there's a chance that his tank has no baffles on the inside. Not like the newer ones anyway.