dremartinez are you possibly using E85 or a high ethanol blend of gasoline? When the ethanol blend increases my vehicle mileages drop quickly. 24 mpg seems way too low if you're not ricky racing it all the time even with a new "tight" motor. If there is a lesser percentage ethanol gas available like E10 or E15 and you've been using high ethanol content try switching and see what happens after a few tanks. The first tank or two may not dilute the Ethanol a lot if you're topping off a half full tank of E85, it will take 3-5 tanks to get the Ethanol percentage down enough to see a potentially meaningfull mileage increase.