For kicks I decided to compare this to the 2002 Oldsmobile Intrigue that my Yaris replaced, and my wife’s 2000 Ford Explorer 4×4.

Your cost savings will very depending on your vehicle. Things to take into consideration with my calculations:

• I used the manufactures’ city MPG numbers because I do most of my driving in the city, but there were times when I drove both highway and city
• I subtracted 1 gallon from each of the tank capacities because most people do not pull up to the pump on an empty tank (My Yaris has an 11 gallon tank and I fill it up when it gets down to the 1 gallon mark)
• The estimated number of fill ups was calculated by dividing the total miles I drove in the Yaris by the range someone can drive in the city for each respective vehicle
• The estimated fuel consumed was calculated by multiplying the estimated number of fill ups by tank capacity
• The average price per gal was determined by taking the price per gallon I recorded each time I filled up the Yaris, and averaging those prices together
• The estimated cost to fuel was calculated by multiplying the estimated fuel consumed by the average price per gallon
• The estimated cost savings was calculated by subtracting the actual total cost to fill the Yaris from the estimated cost of fueling the other vehicle