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well it depends on what mods are getting you to 400rwhp, boltons and heads and cam ive actually seen people inprove MPG because the combusttion is more efficent

more cubes is deffenatly gonna kill your mog though

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Posted By: pzh0bm On: 06-03-2008 @ 11:43:28     Reply | Top | Edit

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I am not at 400 RWHP but I am putting down 372RWHP and 360 RWTP. I went from getting 28 MPG to 20 MPG. My mods are in my sig. My cam is a baby cam speced at 224/224/581/581 114LSA.

I cant believe I lost 8 MPG on gaining 80 RWHP.
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60 foot 2.093 330 foot 5.725 1/8 8.646 1/4 13.226 @ 107.93 mph old time new time to come.
LS6 Manifold, Comp Cam 224 224 581 581 114LSA, Hooker LT Headers, Hooker Y Pipe, 3" Magnaflow Exhaust, SLP Underdrive Pulley, CAT Delete
160 Degree Stat, CAI, SLP Lid, Smooth Bellows, Custom Tune

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Posted By: PongoX11   On: 06-03-2008 @ 17:55:12     Reply | Top | Edit

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I got GREAT mileage in my car when I was taking it easy, not too far from stock--but when I got into the boost I'd probably be under 10mpg.
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Former ride: 531RWHP/477RWTQ Only bolt ons! ...technically everything used a bolt to install
"94RedFormula: Just think how many more babes you can SIIHP if you're a non-smoker!! "
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Posted By: Lukn4Trbl On: 06-04-2008 @ 08:58:50     Reply | Top | Edit

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I'm getting great mileage on the highway. I haven't
measured it religously, but I will estimate

350 miles to the tank highway based on several
trips I've made this year.

For city/hwy mix, it's not bad either. Just two
weeks ago I threw in $40.00 of Sunoco 94 @ $1.20/litre.

I drove from my home town to the drag strip; made
three passes; drove back home...went out to the
Keg, and back home. Went to my shop next day,
and only then the gas light came on.

My estimate would be 300 KMs, on 33 litres.

or 187.5 miles on 8.7 gallons of fuel.

21.5 MPG (mixed use, and 'some' racing)

Nearly 26 MPG on highway.

To that note, I'm a fairly aggressive driver as
well. If I kept my foot out of it, I bet 28 MPG
would be a breeze.
--
Welcome to the Internet, where everyone's a mechanic and has a 10 second car.

2000 Camaro SS, 6 Speed, Black/Black. Going for low 12's!
1980 Z28 - Miss ya buddy!

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Posted By: Antivtec On: 06-04-2008 @ 14:14:00     Reply | Top | Edit

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aftermarket heads, a smaller cam, fast 90/90, and exhaust will put you over 400 rwhp and keep about the same mileage you have now
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1994 Red Z28 hardtop M6-now only a memory

1999 camaro ss m6 black with t's
Magnaflow exhaust, ta girdle with 3.90 gears, lakewood RCA and panhard

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Posted By: RedScreaminMachine On: 06-06-2008 @ 08:47:20     Reply | Top | Edit

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I get anywhere from 23 mpg to 10 mpg depending on my driving. I have 4.10 gears.
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Red 2002 Camaro Z28 M6
Blue 1994 Camaro Z28 A4
[ Edited on 06/21/2008 @ 17:45:59 ]

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Posted By: kingandrew On: 06-16-2008 @ 17:11:51     Reply | Top | Edit

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"more cubes is deffenatly gonna kill your mog though"

Werd
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99 m6 Trans Am, Dynatech stainless steel longtubes, 391rwhp, dual cut-outs, SLP CAI, LSX intake,TR224 cam

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Posted By: whitenredfbody On: 06-19-2008 @ 23:36:01     Reply | Top | Edit

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see sig on RWHP/mods....i didn't really measure it but i got atleast 23-25 99% sure...i got way btter than i do in my stock trailblazer i can tell you that
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NBM 99 camaro z28
appearance: TT's 17x9.5/17x11,halo's,eibach pro-kit,Z06 style Z28 badges,tint,black beger panel
performance:Clear lid,K&N air filter,TByrne MAF,Ported & Polished ThrottleBody,Ported LS6 intake,LS6 ported Oil Pump,LS2 timing chain,Pacesetter coated LT's,TSP catted Y,SLP LM2 exhaust,QTP elec. cutout,STAGE II Patriot Performance Heads 2.02/1.57 59(cc),comp 231/237 .585/.595 112
442 RWHP/418 RWTQ

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Posted By: Lukn4Trbl On: 06-23-2008 @ 12:42:06     Reply | Top | Edit

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FYI: I've been doing some tuning (HP Tuners)
and have leaned out the cruise AFR to about 15.3:1
and played with the timing.

It seems to be getting better mileage in the city,
and highway.

I've set the AFR to lean out between idle and 3000 RPM.

Engine temps, and the spark plug readings look great.

I'll update this at a later time and let you
know the difference.
--
Welcome to the Internet, where everyone's a mechanic and has a 10 second car.

2000 Camaro SS, 6 Speed, Black/Black. Going for low 12's!
1980 Z28 - Miss ya buddy!

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Posted By: ObsidianSixer On: 06-28-2008 @ 17:37:36     Reply | Top | Edit

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lol i wanna know what that setup is with the head/cam will get you better gas economy
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"next time you jack it up, give em a squeeze" - Pocket

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Posted By: datzneat On: 07-09-2008 @ 01:11:29     Reply | Top | Edit

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I gained 4mpg hwy. Lost 3mpg city. Mods: MS3, 5.3l 2.5heads, 92/92, tsp headers.
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Posted By: 327BlackBird On: 08-12-2008 @ 20:14:43     Reply | Top | Edit

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Tino your an agressive driver? nahhhhhhh i dont belive it, i mean you only chased that vette down doing about 200 kph on the highway lol
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1980 Camaro Z28
2006 Silverado Special Edition/ 2007 Silverado 4x4 LT

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Posted By: Lukn4Trbl On: 08-12-2008 @ 21:56:18     Reply | Top | Edit

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It was only because I was exicted to have you beside me.
--
Welcome to the Internet, where everyone's a mechanic and has a 10 second car.

2000 Camaro SS, 6 Speed, Black/Black. Going for low 12's!
1980 Z28 - Miss ya buddy!

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Posted By: deadly_z28 On: 08-27-2008 @ 23:29:09     Reply | Top | Edit

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i was doing 432/401 in the old z. floored it everywhere. always got about 8mpg.

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