Answer: Option one is the best option.
Step-by-step explanation:
Calculating option one, which is 2/(1/16 + 1/65) gets you 25.7 mpg.
Calculating option two, which is 2/(1/14 + 1/85) gets you 24.0 mpg.
They should choose option one because it is a better combined mpg since they improved the least-efficient gas vehicle.
