Quote:
Originally Posted by SentraSE-R
Unfortunately, there are no LRR tires small enough in 17" size to fit my car. I could possibly go with 205/50-17 tires, but they're >5% taller, and may start rubbing.
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I believe that will be a deal-breaker. Considering that your driving style includes low speeds to minimize aero losses, and very little braking, rolling resistance is probably a strong determinant of your fuel economy.
Additionally, considering the traditional customer for such products, there's a poor selection of narrow, aerodynamic 17" wheels. Although your car may never reach 60mph, the tops of your wheels will reach 90mph, so wheel aerodynamics is important.
Do you P&G on the open road? If so, you've already cut back to the minimum number of revs per mile. Regearing would just increase the duration of your pulses.
You've identified many ways for this mod to cost you plenty of fuel, and I don't see many ways for you to pick up mpg savings.