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Thread: 402-408 h/c/i gas mileage ?
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06-12-2009, 03:06 AM #1
402-408 h/c/i gas mileage ?
what kind of gas mileage is everyone getting with a 402-408 h/c/i na builds?
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06-12-2009, 03:07 AM #2
- Join Date
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- Beaver Dam KY
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79 T/A -91 Firebird- 1998 Trans Am -Oynx Black
I think Luos is getting a lil over 20 on the highway with Slowass.
A4 or m6?
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06-12-2009, 04:33 AM #3
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- Retired Outlaw Sum Bitch
25mpg cruising at 70mph @1900 rpm.
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06-12-2009, 10:21 AM #4
in town about 15mpg.
Cold Air Intake, Muffler Delete, Vinci High Performance Dual Valve Springs, Hardened Pushrods, Yella Terra 1.85 Rockers, Some Hydropdipped Stuff, Strut Tower Brace, Some SS Badges, boost/vacuum gauge, fuel pressure gauge, some checkered stripes, drilled/slotted rotors, ZL1addons Stealth wickerbill, Ruxifey LED side markers
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06-12-2009, 02:27 PM #5
m6. they told me it was getting 17 mpg hwy.
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06-12-2009, 04:26 PM #6
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06-12-2009, 04:48 PM #7
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06-12-2009, 08:30 PM #8
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Red Tint Jewelcoat- 2008 Trailblazer SS
I don't believe this for a second.
Unless your 4th gear (you have automatic right?) is .50 rather than the typical .70.
Even sporting a 3.42 axle ratio, you should be right around 2100RPM at 70MPH.
Hell, in stock form that car shouldn't have gotten 25MPG highway with the auto.
Oh, and my 248/254 cammed 402 gets 20MPG on the highway. M6 with 4.11's.
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06-21-2009, 12:35 PM #9
I think it all depends on the size cam you decide on... neways goodluck with your build let us kno the results.
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06-22-2009, 03:44 PM #10
got 26 mpg at 70 mph through a m6. cam 247/251 623/623 . not bad . in town 8 mpg .lol
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06-22-2009, 07:49 PM #11
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06-23-2009, 03:51 AM #12
heads are afr 225 milled to 65cc. stock gto gears for a m6. 3.42 i think. car runs 1800 rpm at 70 mph.
Last edited by jmdgto; 06-23-2009 at 03:53 AM.
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06-23-2009, 05:30 AM #13
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06-26-2009, 01:54 PM #14
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Stock- 2002 Camaro
mixed driving i get about 16mpg. freeway is about 22mpg
i've got a semi heavy foot
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06-26-2009, 02:05 PM #15
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06-26-2009, 02:20 PM #16
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06-26-2009, 02:46 PM #17
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