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i think the sharp sound comes from the alt belt because there is not enough tension on it
and the voltage drop on the battery is maybe because the battery is too old. but I dont think your alternator is bad
i think you need to test the capacity of your battery and compare with a new one
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Best Tank (1557.2 Km): 2.57 LHK (91.63 MPG (US) )
Best Highway Trip (~36.8 Km): 2.16 LHK (109 MPG (US) )
Best Commute Trip avg (73.8 Km ): 2.33 LHK (101 MPG (US) )
 Echo-Troll Modding Thread
I know i dont have a very good write-up 
no lean-burn? no good gear ratio? p&g is the answer
MPG=1 TIME=0
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