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I'm not saying that 23 mpg average is impossible in a blazer/jimmy 4 door but DAMN!!!! That is almost too good. Wen I owned my 99 4 door blazer with 4.3 4wdand 3.42 gear ratio I think my best tank was maybe 20 all mountain highway. What gear ratio are you rocking and are you doing any neutral costing or PNG?
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