There are many many factors affecting energy economy. ECO versus D does not automatically mean better or worse energy economy. It depends on your specific circumstances. For example, in my case, I live atop a hill. I have observed large inefficiency and large inconsistency of energy use in climbing/descending. On top of that, I do not drive much (7500 miles/year). That means differences arising from other variables: ECO vs D, A/C versus no A/C, 36 psi versus 44 psi tire pressure etc. are lost in the "noise" of inconsistent energy use in climbing/descending, so I can't really claim whether D or ECO is better based on my own data.mkjayakumar said:The folks who get less than 4, are you all driving in 'D' or 'ECO' mode ?