Take them back and get the 225s. You'll be happier.

Your present tires are just a bit tall, which means your speedo will read a bit slow, and your odo will err to the small side. So, while your mileage may actually suffer a bit because of the taller tire, part of the decrease in mileage is attributable to the odo error.

Function before fashion. '96 Contour SE "Toss the Contour into a corner, and it's as easy to catch as a softball thrown by a preschooler." -Edmunds, 1998