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how much hiway MPG loss with big cams?

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Old 11-29-2006, 03:33 PM
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Default how much hiway MPG loss with big cams?

Is there are sizeable loss in hiway MPG due to the loss of DCR with something like an MS4 in an close to stock 02 LS1 / T56?
Old 11-29-2006, 03:37 PM
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In my vette it actually stayed t e same and then increased after adding dart heads.
Old 11-29-2006, 04:22 PM
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highway shouldnt change too much. i still get 25+ highway. city on the other hand dropped a good bit. might be cause i get on it more too.
Old 11-29-2006, 05:14 PM
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i asked this in the gto section because people were postin up mileages and stock people were gettin 22-24 on the highway and people with heads/cam were gettin 26-28.... i was astonished but everyone swears by it!
Old 11-29-2006, 06:19 PM
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Mine went up a little on the highyway, but dropped significantly in city. I'd say I get 28 on the highway and around 12mph in the city.
Old 11-29-2006, 07:01 PM
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Originally Posted by mikeith
i asked this in the gto section because people were postin up mileages and stock people were gettin 22-24 on the highway and people with heads/cam were gettin 26-28.... i was astonished but everyone swears by it!

I would believe it. I was getting 28 stock and 28 with a cam. Then I added heads and went to 31. This was cruising at 75 mph with the cruise on.
Old 11-29-2006, 07:19 PM
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Last I checked, I was getting 16 MPG with a combination of highway and city driving in my M6. I have a 12-bolt with 3.90s in addition to the cam, though.

Josh
Old 12-02-2006, 10:51 AM
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mine stayed the same, i was getting 25mpg stock, then 23mpg bolt ons, then 22mpg w/ BO & 3.73, then 24mpg with the cam, then 25mpg w/ the heads




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