I installed 1NZFE 1.5 Automatic in my 2003 2.0D Saloon Corolla almost a year ago. The car is giving very poor mileage, I have measured it three times by filling the tank completely and then using the fuel completely, the mileage is 7KM/L Barely (Without AC). I use genuine Oil/Air Filters, change oil after 8000KM, currently using Shell Helix Ultra 5W40(Gray Box), despite spending so much on the car and maintaining it, the car is giving very poor mileage. I need help.
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