lets do it again, latest Golf GTI has 125+ g/km CO2

That's not true. That is where the auto industry is lying about CO2 with their biased test cycles and legal loopholes permitting all kinds of cheating on "official fuel consumption"

Let's take some real world numbers from real world people who drive on really drive on the streets and record their mileage:

https://www.spritmonitor.de/en/overview/50-Volkswagen/452-Golf.html?fueltype=2&fuelsort=6&constyear_s=2017&powerunit=2You can see that the latest golf in gasoline version consumes in average 7.06 l/100km. Facts.

Incidentally, you also can see that a 2004 golf has 7,55 l/100km

a 1984 golf is at 8,21 l/100km in real world use

So the efficiency of engines are better, but the cars are heavier, wider, taller and longer, so the fuel consumption is not much better than 20-30 years ago, despite the lies of the auto industry.

Now 7,06 l/100km gives off 16,58 kg of CO2 / 100km ->

** 165g/km for the Wv Golf**Now for the powerplant, taking the same gasoline as a fuel:

1 liter of gasoline gives about 9.5 kWh of thermal energy. The powerplant is 46% efficient, worst case, the grid losses are 10% -> 1liter of gas -> 3.93 kwh at the consumer.

A typical BEV, the nissan leaf consumes about 163Wh/km

https://www.spritmonitor.de/en/overview/33-Nissan/1296-Leaf.html?powerunit=2So that would be 16.3 kWh/100km -> 4.14 l/100km ->

**96 g/km for the Leaf with 100% fossil electricity !****So when you take 100% fossil electricity, and a bad efficiency power plant, the leaf is only 1.7x better than the VW golf gasoline in real world**When factoring in renewable electricity, depending on the country's electricity mix, you can come to much much higher factors.

Funny fact : the e-golf consumes 16.01 kWh/100km, practically the same than the leaf, and allows a direct comparison with the gasoline golf !!!

https://www.spritmonitor.de/en/overview/50-Volkswagen/452-Golf.html?fueltype=5&powerunit=2