Suppose that technological issues have been solved,

**plug in electric cars**are available on the market, and**everybody charges his car when he gets home in the evening**.**How much would it be your electric bill then?**

On average, every electric car would cost about

**$1.25 per day**.Let's see why.

To get to this result, consider the

**amount of gasoline that US uses in one day**: 380 millions of gallons (pretty impressive!).As there are

**254 millions of cars**, it's about**1.5 gallon per car, per day**.**energy content**of 121 MJoule per gallon.

Therefore each car use

**181.5 MJ per day**.

Suppose that internal combustion engine has an efficiency of 15%, while electric cars can go up to 60% (including losses in the charging/discharging of batteries). Therefore

**an electric car would need about 45 MJ per day**.

That is

**12.5 KWh per day**.

At an average cost of electrical energy of 10 cents per KWh, we get

**$1.25 per day**.