Divide total tank capacity by number of total bars ! Dat will give u litre of fuel in each bar , multiply that with ur fuel average and ull get ur ans ,
For example
2nd gen vitz has 42 litre tank and total 8 bars means 5.25 liters of fuel per bar
5.25 multiplied by 12 kmpl average
Means 63 km in one bar
Expect more average in 1st bar compared to others
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