I’ll use my two, similar sized cars as an example (Subaru Outback and Hyundai Ioniq 5). Typical driving gets me around 8 L/100km in the Outback and 20 kWh/100km in the Ioniq. This NRCan site gives a conversion factor of 8.9 kWh/L of gasoline.

So, the Ioniq, at 20 kWh/100km is then about 72% more efficient than the Subaru at its equivalent 71.2 kWh/100km.

Even when considering lifetime emissions, EVs still have roughly 50% less emissions than ICE vehicles.

However, going back to my original point, person vehicles are still incredibly inefficient overall, given the potential alternatives.