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Poor gas mileage on 1999 Volkswagen Cabrio

Replaced wires,plugs,cap and rotor
IGet 16.4 mpg from 24mpg

Volkswagen parts or aftermarket?
You dont check the ffilter , u just replace , there cheaps.
1 more answer , 1 more comment
Try the air + fuel filter ..
How do you check the fuel filter?