Not as much as you think. 2019 f150 is rated 22/30 mpg. 2019 Honda Civic is 32/40. (Side note, a Prius will only get you to about 50) So you are going to spend

Not as much as you think. 2019 f150 is rated 22/30 mpg. 2019 Honda Civic is 32/40. (Side note, a Prius will only get you to about 50) So you are going to spend 20-30% less on gas which, depending on how much you drive and gas prices, might amount to around $100/month. Then of course deduct the cost of a rental and the hassle and if you need a truck once a month, you are already about even.