highway i average 16.2 l/100km @ 120km/h
city a little bit less because i drive like a maniac!
bought truck with 29,800km on it 2011 Ecoboost every option minus nav, and power seats/ leather paid $34,600 after tax and with my extended warranty.
also traded an 06 dodge ram 3500 1 ton with really high kilometres and got $17,200 on trade towards it. and they threw in my leveling/block kit, under coating, a tonneau cover and a few oil changes.
bully dog tuner/full factory upgrade roush exhaust system/airrade dual cold air intake ran into my fully functional dual inlet APR ram air hood.
when all i had done was just bigger tires (only 1 size taller than stock). it didnt affect my fuel economy any. but i drive my vehicles hard. and still get great fuel econ.