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Discussion Starter · #1 ·
I own an O2 Buick Park avenue ultra with it OEM supercharger and the mileage on the freeway without putting your foot into it is around 185 something like that is that normal for this V6
 

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Some folks see near 200, but that's not too bad.

In reality, what units are you using? Did you mean to say 18.5, which is typically 7-10mpg below what most see, with some able to still get in the 30's at a regular cruise. You might need to scan what the fuel trims are doing while driving, and monitor various air and fuel parameters to get an idea what may be causing it to be lower than normal.
 

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Discussion Starter · #3 ·
Yes 18.5 maybe 18.8 I'll try to clean the mass air flow sensor not try I mean I will I guess I need to pull some plugs the wires look new what about those what is the OEM spec for the plugs
 
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