Your car gets 22 miles per gallon (mpg) at 55 miles per hour (mph) and 18 mpg at 65 mph. at what speed should you make a 450-mile trip 1. if gas costs $2.95 per gallon and your time is worth $17/hour? 2. if gas costs $3.80 per gallon and your time is worth $11.5/hour? 3. if gas costs $4.75 per gallon and your time is worth $8.9/hour? 4. building an excel spreadsheet to calculate the total trip cost for gas costs of $2.5, $3.5, $4.5, and $5.5 and values of time of $6.5, $9.5, $12.5, $15.5, and $18.5 per hour. do two tables: one at 55 mph and one at 65 mph.