Salam,
I have civic 2003 exi prosmatic, in city i am getting 6km/L and on highway is giving14km/L. I have done tuneup from 2 different places, plugs, injectors, map sensor, changed. fuel pump cleaned, tapet adjusted and with computer inspection everything is fine.nothing helped in local milage increase.
The mechanic said it can be your tyres, because in long it gives good milage on speed of 110, 120.
My tyres are 195 65 R15 and on the door it says 175 70 R13.
And now my front shocks started to leak, rakends almost gone, stearing box has play and dook sound when going over pot holes. bought it 1 year ago and all these thing were fine.
I am suspecting heavy alloy wheels and large tyres.