On a 2005 S convertible, 6-speed manual, the best mpg I can get, moslty highway and light-foot driving, is 25 mpg.

I bought the car used at 34,000 miles (now 37,000), and replaced all fluids, lubricants, belts, hoses, filters, etc. Also had the cat replaced due to a rattle. None has improved the mpg.

I'd appreciate any guidance or help that would lead to improving the mpg.