NO!!!

Here is a crude explanation.

The issue is that a gasoline (and diesel) engine is usually less than 40% efficient. That means that 60% of your gallon per 18 miles heats the air, that is 0.6 gallon fuel wasted per 18 miles. So, your fuel consumption for driving is actually 0.4 gallons per 18 miles or 45 MPG. When you tow, about the same 0.6 gallons will be wasted per 18 miles. This is 0.6*12/18=0.4 gallons wasted per 12 miles, so the real consumption now is 0.6 gallons per 12 miles, or 20 MPG. The true consumption goes down for you from 45 MPG to 20 MPG, more than 50%.

Electric cars are a lot more efficient, like 85% efficient. So, the wasted energy is much smaller, and you will see a lot more dramatic increase in consumption than the increase you see on gasoline or diesel cars.