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Kerry, I don't think that a 15% rise in gear ratio will give 15% better gas mileage. Correct me if I'm wrong, but I don't think that it's a parallel relationship.
To figure it out you would need to know what the specific fuel consumption (lb/hr/hp) is for a 4AGE20V and then calculate the lbs. per minute fuel flow required at two RPM points; cruise speed with the shorter gear and then again with the taller gear.
I punched some numbers not specific to the 20V and came up with a drop of 7.5% in fuel consumption for a drop in cruise engine speed of 800rpms: 3800rpms to 3000rpms. So you might expect to see an improvement in fuel economy from 34mpg to about 36mpg.
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