PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Do I need tuning or what??

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Old Jun 4, 2003 | 10:59 PM
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Default Do I need tuning or what??

I hear of people getting upwards of 25 MPG in the city with a cam. I still have the stock internals and I can only get 20 MPG on the highway!!!!! Could it be that I have 86,000 miles also or what b/c I really need more MPG. Could tuning be an issue too.
(I had no idea where to post this)
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Old Jun 5, 2003 | 10:52 AM
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Default Re: Do I need tuning or what??

I doubt you will ever get 25 MPG city with a fbody. I get 20 to 23 mpg combined city/highway depending on how I drive. A cam will hurt your fuel economy, not improve it.
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Old Jun 5, 2003 | 12:54 PM
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Default Re: Do I need tuning or what??

I don't have a cam though and I can barely get 20 MPG on the highway with a 6 speed car!!!!!
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Old Jun 5, 2003 | 01:35 PM
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Default Re: Do I need tuning or what??

How fast do you go on the highway, and do you set the cruise or speed up slow down a lot? Air drag varies as the square of velocity; i.e. doubling your speed increases drag by four times.

But if you think there is something wrong, give your engine a tune-up and take some Atap readings.
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