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CITY GAS MILAGE
By JWL on
2009 Buick Enclave CXL 4dr SUV (3.6L 6cyl 6A)
Buick claims a city gas milage of 17 mpg on the EPA sticker. In straight city driving under the most conservative starts and stops my Enclave gets an averave of 11.7 MPG. I have provided the dealership the gas receipts and milage. The fact is that the 6 speed electrocic transmission holds the car in 2nd gear at 30 miles an hour causing the engine to Tach at a steady 1900 RPM. When the car passes 40 MPH the Tach drops to 1200 RPM. I was contacted by GM's Division Manager who told me that is how the transmission is calibrated and there is nothing they can do about it. I bought this car based on the fuel estimates and I feel that they should be able to produce what they advertise. 31% less.
Calibrate the Transmission. Right now it costs as much gas to run at 30 MPH as it does to run at 65 MPH soley on the fact that the vechile is held in a lower gear at 30 MPH. Try it on your Enclave.