I own a 2015 Chevy volt. When running on gas, the mileage is ok, but far surpassed by most anything hybrid. When running on electric, I calculate the mileage

I own a 2015 Chevy volt. When running on gas, the mileage is ok, but far surpassed by most anything hybrid. When running on electric, I calculate the mileage by electrical charge price vs the gas price and end up getting 120-150 mpg equivalent. Since mostly we drive around the city/suburbs, we only use the gas engine for airport runs or long trips. Sure I could have an all electric car (and I do) but it would get annoying having to rent a car whenever I wanted to go to another city. EDIT: The only way the volt makes sense is if you can charge it daily and drive mostly on full electric, and still need to periodically take road trips.