I've got a 98 Mustang V6 5 speed with an underdrive pulley and a partial lower grill block. Not sure if the grill block helped but the pulley definitely brought my mpg up. I'll be installing a catback soon and I'm thinking about an air dam, lowering springs, and maybe a little weight reduction. Currently gets around 24 mpg and I don't hypermile it. Glad to see more Mustangs on ecomodder!
