The numbers aren't too difficult to verify.

I found this Canadian government web page that says it's roughly 8.9 kWh, so that checks out.

Looking at the fuel efficiency table on that same website, it looks like OP used a reasonable average fuel efficiency of 30 mpg or slightly under 8L/100km: 4 miles / 30mpg = 0.13 gallons, or 0.492 liters, so their claim of half a liter of gas also checks out.

The cheapest commercial energy in the US appears to be in North Dakota at $0.0741/kWh, so using $0.05/kWh was very generous.

The average Netflix user watches about 2 hours per day, or 60 hours per month.

Just in an attempt to be a bit more accurate, let's assume the individual user's television and internet router use about 900W, so we'll use a final number of 8kW for Netflix's power use per user.

8 kW * 60 hours= 480 kWh

And the cost of all of those kWh at $0.05: 480 kWh * $0.05 = $24.00

Or, the cost in the least expensive state in the US: 480 kWh * $0.0741 = $35.57

National average is $0.14/kWh, so unless Netflix was serving everyone out of North Dakota and Texas, their average cost per user would be much closer to $70 per user.

OP's numbers were definitely already accurate enough for the point. Basically, there's no possible way Netflix needs that much electricity to serve their users.