I picked up a Jeep Grand Cherokee with the 6 (trying to do my thing for the planet). The hype and the sticker said I should get 30 MPG HWY and 22 City (Imp gal). Well on the HWY if I keep it under 110KM, a speed so low it can get you killed on the 407, without AC, I can get 23 mpg. In the city, I am taking it very very easy and getting 16 MPG without AC. It is disappointing to say the least. Can anyone explain this major discrepancy? I believe HWY is measured at 55 MPH or 89 KPH but how different could my “easy” city driving be.