Buddy if u calculate very carefully and do it manually ..like ...petrol filled to distamce travelled and calculate the distance till the car is again on fumes ...u will know the real value
My Avg metre shows 18.6 kpl while true average by doing manual calculation is close to 16.8 kpl at motorway ( journey of 700 kms ) ... and this is true becoz if u see manufacturer rating for Honda Ivtec 1.3 ...it is 16 kpl at 120 kph and around 17 at 110 kph
Saying that 1.8 gives 18 - 19 kpl is is totally wrong .. u know the best u can get from 8th gen Civic is no more than 14.5 kpl on highway ..mind you this os the theoratical maximum ... This is what Honda Says ....
Just google it and u will find hundreds of proofs ...
My friends don't mis guide or live in fool's paradise your self ... do a manual calculation ... saying 1.8 ltr gives 18 kpl is impossible ( I know it becoz I use to say the same untill I started calculating manually )
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