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whats peoples average mpg on 3.4 setup?



My DIC is usually off by about 7/10's of a gallon per 12 gallons it says I use, in the bad direction. In the winter I'm getting about 14 city and 26 highway, summer 16 city and maybe 30 highway. My mpg dropped quite a bit when I went from stock alloy wheels to heavy 18's.
 
Maybe thats part of my problem ive got stupid crome 18's on it....i bought it with them on it and wish i could afford to get different ones...i just got new tire on them soo id have to get another set of 18's
 
A little off topic from the OP question, but, with everybody noticing such a loss in MPG when switching to larger wheels (as mentioned above), I think I will keep the little 16's on for a while. Stout new BFG tires will help out the looks and traction, and maintain MPG, because my Michelins are dead.
 


I've got 235/55/17 '05+ Bullitts...and they are heavy wheels. You can click the link in my signature for mods...I get anywhere from 28-32 MPG's on the highway constantly...mixed city/highway I'll see about 22-24. In the city...if I'm nice to it...about 15-17...but most of the time about 12-14 in the city...because hammering on it from 40 or under is fun...and just leaves 2 nice black marks :D
 
bluegtp91 said:
I've got 235/55/17 '05+ Bullitts...and they are heavy wheels. You can click the link in my signature for mods...I get anywhere from 28-32 MPG's on the highway constantly...mixed city/highway I'll see about 22-24. In the city...if I'm nice to it...about 15-17...but most of the time about 12-14 in the city...because hammering on it from 40 or under is fun...and just leaves 2 nice black marks :D
Click to expand...

What link goes to your mods? Not either of the two I see. I'm sure the cam doesn't help. Aren't you on 3.29's?
 
Yes 3.29's...and the 1st link goes right to it. I just clicked it to make sure...but just incase...you missed it.

Bulldog Racing Engines Balanced and Align Bored L67 3800 Series II V6
ARP Head Studs
ARP Main Studs
Clevite77 Main/Cam/Rod Bearings
Balance Shaft Deleted
GM '04+ L32 Powdered Connecting Rods
GM '04+ L32 TTY Rod Bolts
GM '03 8.5:1 Compression L67 Pistons
Thrasher Engineered Performance Race Camshaft (.574/.566 114 LSA)
GM LS7 Lifters
Comp Cams Rocker Arm Bolts
Intense-Racing O/R Stock Length Pushrods
Bulldog Racing Engines Custom Ported/Polished L67 Heads
Manley #130 Valve Springs
Manley Titanium Retainers
GM OEM Valve Guides Milled .100" for cam clearance
GM '04+ L32 Valves
Comp Cams Valve Locks
Viton Valve Seals
Devil's Own Methanol Injection
Ported Lower Intake Manifold Inlet/Runners
Ported Factory GM GenIII M90 Supercharger:
-Rebuilt using OEM GM Seals/Fluids/Bearings
-Ported Inlet/Outlet
-Machined Supercharger Snout
Custom LS1 Throttle Body Setup/Polished Adapter Plate
LQ4 MAF Sensor w/ Open Cone Intake Setup
ZZPerformance Modular Pulley System includes 3.2/3.0/2.8/2.6
ZZPerformance 160* Thermostat
Custom HP Tuners Tuned PCM
Pacesetter Headers:
-2000* Resistant Armor Coated
-1 7/8" Primaries - 3" Downpipe
-Custom Welded 2 Piece Design
-Catless
Gene & Calvin's Custom Exhaust Setups
1) Street Exhaust - 3" Custom Bent, 26" Glasspack/Spintech Universal Race Bullet Muffler with 4" G8 GXP Replica Tips
2) Offroad Exhaust - 3" Mandrel Bent Piping, 26" Glasspack, No Muffler, Dumped Behind Pass. Rear Tire (In Video)
MSD Ignition Coil Packs
MSD Ignition 8.5mm Spark Plug Wires
Autolite 103 Copper Core Spark Plugs
Triple Edge Performance Built 4T65E-HD
3.29 Gears
Trans-Go Shift Kit
Full Rebuild with Hardened Clutches/Bands
Hardened 4th Shaft
7/8" Single Chain Setup
Allison TransSend Transmission Fluid
 
I liked the "whoring" part better...plus...apparently teh guy couldn't click "more" on my youtube video info.
 


Well this sucks...I just reached half a tank on my gas gauge and have only gone 100 some odd miles...idk what to trust the dic with how much fuel iv used or the tm gas gauge that ppl say are usually off lol any suggestion?
 
^ Maybe you drove with one foot on the brake, or some hawt heavies in the back seat?

But seriously, as been stated, it all depends. Were those 100 miles accumulated making 1/4 mile passes at the local dragstrip?
 
I will admit that I do put my foot down at times but not an insane amount but I guess that would make sense plus I dint even think about this but we think my cat is clogged...
 
^ Oh yes, if your cat is clogged you will be getting low MPG, and lacking a lot of power. Best to get that fixed soon.
 


Only problem iv got is I can't get the darn DP loosened iv been tryin to get a friend of mine use his air compressor and torque reach but things haven't been working out much.but I do all ready have an o2 emulated on it just have to find a way to get the cat off and clogged
 
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