Can taller tires increase highway fuel mileage?

I bought a saturn sc2 for my 100 mile round trip comute to work. Paid only a grand and its probably saved me at least 2g's in gas by now. It gets around 31 mpg highway. The only thing is the overdrive is geared way to low.(manual trans btw) I guess they thought if they put in the correct gear people would get... show more I bought a saturn sc2 for my 100 mile round trip comute to work. Paid only a grand and its probably saved me at least 2g's in gas by now. It gets around 31 mpg highway. The only thing is the overdrive is geared way to low.(manual trans btw) I guess they thought if they put in the correct gear people would get way to great of gas mileage. The car turns 5 grand more rpms than is necesary. Anyway I was wondering if I should by taller tires when I need them. Seems like this would improve the gas mileage. Do you think this would even make a difference?
Update: BTW, My comute is 90% highway.
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