Sara drives 96 miles on 3.2 gallons of gas. She uses this information to calculate how many miles per gallon she can drive. Using this result, how many miles can Sara drive on 12.5 gallons of gas?

Sara can drive 96/3.2 = <<96/3.2=30>>30 miles per gallon.

Therefore, she can drive 30 x 12.5 = <<30*12.5=375>>375 miles on 12.5 gallons of gas. Answer: \boxed{375}.