6 is good with the eco button off (I'm averaging 5.8 over 4500kms since new) I am used to driving with the eco button on (still climbs hills with ease and easy passing too ) I guess you would get used to it in eco mode but saving 30 cents per 100 km i would rather the extra power, but thats just me. With me driving and in different environment conditions, not sure how much difference the eco button makes (but $3 a tank sounds realistic) For my next tank I might try with the eco button off, but after 3 or 4 years of driving for economy it maybe a hard habit to break LOL Yeah it depends what your used to, i stepped out of a fg xr6 turbo into this, so going from 12 to 13L/100km to 6 i am pretty happy.