I agree with Tod on this one, run as much air as you can without spinning the tires, it will fo sure handle better on top end.
I run 10.5lbs to 12.0 on my Malibu. Anything less than 10.5 the car handle like crap on top end. My car is considerably heaver than the Vega @ 3250lbs, but on top end the car doesn't know how much it weighs.
JMO
Zip.