So, I have the problem to convert mpg to lp100km.
I have tried to calculate them by hand, given that 1 mile = 1.60934 km and 1 gallon = 3.78541 litres, and it yields me like: 1 mpg = 235.133 lp100km
However, when I searched for the conversion online, there are different values and it makes me confused whether my answer is right or not.
I have also tried to convert back, what I mean here is lp100km->mpg. But why did I get the same result, i.e. 1 lp100km = 235.133 mpg
Can anyone help me with this?
Thanks!
Simple unit analysis: \begin{align*} 1 \frac{\text{mile}}{\text{gallon}} \times \frac{1.60934}{1} \frac{\text{km}}{\text{mile}} \times \frac{1}{100} \frac{\text{100 km}}{\text{km}} \times \frac{1}{3.78541}\frac{\text{gallon}}{\text{L}} = 0.00425142 \frac{\text{100 km}}{\text{L}}, \end{align*} and so, 1 mpg is equivalent to $\frac{1}{0.00425142} = 235.215 \frac{\text{L}}{\text{100 km}}$.
However, keep in mind that mpg and L/100 km are inverse units, so 10 mpg would be equivalent to 23.5215 L/100 km.