Gear ratio calculator (a very good one)

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Strange. I entered the information and compared the difference between my stock 235 tires and if I had the optional 31" tires on my 92 Bronco. It showed a decrease in RPM at sped of just over 100rpm with the larger tires. The decrease in rpm should account for a minor increase in economy but from what everyone has told me in the past, the 235/15 rubber that's on my Bronco is the best possible size option to have on it. Would the added weight of the 31" negate the minor decrease in rpm on an otherwise healthy engine?
 
This is a very handy tool. Was able to plug in numbers to figure out my rear axle ratio also. I got lost day-dreaming of better fuel economy. (y)
 
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