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#2
12-22-2003, 02:15 AM
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Re: 8.1L gas mileage
FYI- A supercharger does not help, nor does a lift, big tires, cold air intake system or any other add on to give you more horsepower. But, you probably knew that.
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#3
12-22-2003, 07:51 AM
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Re: Re: 8.1L gas mileage
8.1 and fuel mileage...isn't that a contradiction of terms?
__________________
Why do you never have enough time or money to do the job right the first time, but enough time and money to do it again? Got all the certifications 25 years ASE Certified Master Technician GM WCT Yea..I work at a DEALERSHIP....got a problem with that? Want to diagnose cars like the Pros? FOR SALE: OTC Perception 2 channel Labscope (badged as a Matco Reality) This is my personal labscope that I use to diagnose waveforms, like new, comes with leads and training video PM Me for details
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#4
12-22-2003, 11:29 AM
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Re: 8.1L gas mileage
My 8.1L gets 4 miles to the gallon in town and 10-12 miles to the gallon on the freeway, and thats only if some lowly ford owner doesn't try to run with me, which ends up costing me about half a tank of gas after I put 5 or 6 car lengths on em......
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#7
12-22-2003, 11:21 PM
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Re: 8.1L gas mileage
Your on the right track, a dual flowmaster or magnaflow on the back end and a high flow air filter or cold air intake will give you more horsepower. The computer will adjust the fuel mixture based on the increased air intake, therefore it would allow more fuel thru. You might actually get more power per the drop of gas with the better air flow, but you will still use just as much fuel. Did that make sense?
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#8
12-26-2003, 09:26 PM
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Re: Re: 8.1L gas mileage
Yes, it makes sense. I guess filling 496 c.i. with gas takes it toll. Don't get me wrong, I'm very happy with the truck...just want the best of both worlds (power & mileage). What kind of HP would I see with a Borla exhaust and different air intake? What about a throttle body riser?
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#10
08-15-2004, 07:25 PM
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Re: 8.1L gas mileage
I have done intake, 4" magnaflow exhaust, Hypertech, new plugs... all that... I have had H.P. gains for sure, but the gas milage has NEVER changed.... 9 in town... 11 Highway...
__________________
 2001 Silverado Crew Cab 2500 HD - 8.1 - Allison 6" RCD Lift with 35" BFG Mud Terrains Airaid Intake - 4" Magnaflow Exhaust - Hypertech Programmer
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#11
08-17-2004, 02:48 AM
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Well I'd assume that TB Spacer would help, or as you said more air flowing but maybe not. but when it is 496 cid in a truck you shouldn't be expecting mileage. Maybe one of those hypertech programmers would help but I wouldnt expect much.
__________________
Wait a minute, you mean to say a bottle of pop is bigger than your engine?? "Pain is weakness leaving your body" There is NO replacement, for displacement... 2007 Kawasaki ZX10-R S.E. 
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