If you live on the east coast of the country than you know that 90% of us do not have 91 octane available to us. We can only use 87, 89, or 93. That is why a eco map for 93 octane would be beneficial.
Just noticed you live in Tri-State area, I live in Ohio and we do not have 91 octane here in the northeast close to cleveland. When I attended school out in bowling green which is so far west is almost on indiana border they had 91 but thats it.