Gas mileage conversion

As far as I can ascertain 1 US gallon is 0.83 Imperial gallons, so with those figures:
- 2.83 x km/L = Imp MPG
- 2.35 x km/L = US MPG

My Honda Civic Hybrid is getting 5.2 L/100 km = 19.23 km/L:
= 54.4 Imp MPG
= 45.2 US MPG