Everybody likes to talk about how electric cars like the Tesla Model 3 are much more cost-efficient to own compared to gasoline powered cars, especially when it comes to fuel costs. Comparing a Tesla Model 3 Performance to something like the Alfa Romeo Giulia Quadrifoglio, the cost savings seem significant.

In the latest video from Engineering Explained, Jason runs through some math comparing the fuel cost efficiency of his personal Tesla Model 3 Performance versus the Alfa Romeo Giulia Quadrifoglio, a vehicle of similar size, weight, performance and price.

The first comparison is simply how much it costs to “fill up” each car with the maximum amount of fuel. For the Model 3 Performance and its 75 kWh battery, in Jason’s case, it could cost \$9.38 for a single fill up. Jason calculated the cost per kWh to be \$0.10 based on his personal energy bill, and used a charging efficiency of 80 percent, which is likely a conservative estimate.

Charging efficiency is exactly how it reads—it’s how efficient the charging system is at feeding energy into the battery. Some energy that is sourced from the power supply is lost in the charging process. Charging a 75 kWh battery requires more than 75 kWh of energy from the source, and that difference determines the charging efficiency.

Tesla has not confirmed a specific number for the Model 3 Performance, so Jason used a conservative estimate of 80 percent efficiency, which would mean it would require 93.8 kWh of energy to fully charge the 75 kWh battery pack.

The cost to fill up the tank on the Giulia Quadrifoglio, using an estimated average cost of \$3 per gallon of premium gas, would cost \$45.90, or about \$36.52 more per fill up.