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Originally Posted by MoNsTeR`ImPaLa
ok before i go let me say
the impala ls gets what they say 38 mpg on the highway
im not sure what the 3.4 gets check it out
and ways all i did was add the cold air intake fender well one from impalahq.com and change the settings in the air fuel ratio
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I posted above what the factory MPG specs are for 3.4's and 3.8