How's your gas milage on your stock or slightly modified 350, what about 305? Whatever motor you have, how many miles do you get per gallon?

 

you can see my combo in my sig. with the 2.73s i got anywhere from 10mpg (normal..romping on it once in a while) to 12mpg (being reeeeeeal nice to the gas pedal).

if i remember right, with my stock L03 i got like 15mpg.

by the way, with the new motor i use 92 octane gas.

-brian

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1991 Camaro RS - ultra blue metallic, t-tops
GMPP 350 HO crate engine - 454 TBI, MSD ignition, SLP exhaust, everything is new
700R4 - 2,400 stall converter, vette servo, shift kit
10 bolt - SLP zexel torsen differential, GM 3.42s
z28boy.fbody.com
z28boy@twcny.rr.com
AIM - "Z28 Boy"

1998 Pontiac Grand Prix GT - 2 door, black

 

Just for comparisons sake, my 91 C2500 gets 17mpg. It weighs 4600lbs, is shaped like a cinder block and has a 3.73 rear axle. Over 158K miles on the odometer.

[This message has been edited by Brent (edited April 12, 2001).]

 

I get around 13 mpg with the TBI setup. I ride on it pretty hard though...

Mike

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1989 RS.. Newly installed 350,bored out 30 over, Hypereutectic pistons, double roller cam, double roller timing chain, accel wires, blue streak cap and rotor, rapidfire plugs, chevy caprice 350 chip, 200* fan switch.

 

I am getting around 15-16 with my TBI maybe around 17 with the last couple of mods I have made I haven't checked in a while.

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87 C-10
305 TBI
(yeah I know its a truck, but you are the best TBI guys I have found)
Performance
**Somewhere around a 17.0 @ 85 ish (G-Tech)
*Freshly rebuilt 305 bored +0.030 over (311)
*K&N Airfilter
*Homemade Ramair w/ modified intake
*180 thermostat
*Custom True dual exhaust(Flowmaster 40's)No Cat's
*TD Performance TBI Spacer
*Mobil 1 10-w30
*Redline Water Wetter
**(alot more done, but I don't feel like boring everybody)

 

1992 firebird 355 - 7mph
2001 trans am 350 - 28mpg highway 18 around town..

technology-priceless

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Shane Buss 92 Firebird 355, Holley 800 Double Pumper Carb, Vortec 1.94/1.50 Heads (Ported,Polished,Milled .025), 10:1 Comp Ratio, Cam Specs 224/234 498/520, 1.6 Roller Rockers, Hooker Headers, Flowmaster, !Cat, 3.73 Posi, Msd 6A Ignition Cyb. Speedo box, Single Plane Intake
http://users.ev1.net/~sdbuss/index.html

Note all girls on web page are x's, and will be removed when i get more time

WEIAND SUPERCHARGER REMOVED

 

Read my sig!
Z28 boy, how close to Rochester are you? My best friend goes to the U of R and I might be driving over to visit him. I'd like to compare our setups. You sound like you're having mad problems with the engine. I have the same engine trans and I even had slightly larger gears yet I'm getting much better milage. I think my city driving (stop light on high street is ever 200 feet no joke) is about 18 mpg. All my shifts are under 2500rpm when I'm a ***** foot it.

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, Jon (350 TBI! it's trenuous and efficacious while getting 23mpg highway with off the shelf eprom)
91 Red RS w/grey int, sq stereo (Alpine v12, kicker solo, MB quart premium etc)AIM: JPrevost

• Holley 670 TB unit w/ 1/2" spacer/adapter
• Edelbrock RPM vortec intake
• 350ho 330hp vortec crate motor
• 8" harm. balancer
• Stewart stage 2 water pump w/160 thermo
• SLP tri-y headers to full 3"
• Rebuilt trans w/ SLP shift kit
• Centerline 16x8's all around
• 36/24 mm sway bars
• Full poly bushings, even motor mounts
• SLP LCA and panhard
• Alston SFCs
• Edelbrock 3 point STB
• Global west steering brace aka wonderbar
• Eibach pro kit springs
• Bilstien high perf. struts and shocks
• All this and I still have AC

My websiteAny questions?

[This message has been edited by JPrevost (edited April 20, 2001).]

 

I'm also getting 23mpg (mostly interstate driving). 350, stock TBI with 350 injectors, Crane Compu-cam, roller tipped rockers, Vortec heads, headers, SLP muffler, no cat or a.i.r., Crane coil, March pulleys.

I was also getting 23-24 with the old 305 TBI totally stock.