I am getting around 27 for my ToyHiHy which has about 800 miles on it. I usually fill at about 5 gals left...just before the idiot light comes on since I don't like being reminded of my mental capacity.

My question is -- Does anyone use "Top Tier" high-detergent-containing gas companies, http://www.toptiergas.com/ or do you use any gas that you come across? Any difference for mileage or maintenence in other words? Toyota is listed as recommending Top Tier, but my dealer doesn't seem to know much about it.

Also, I use 87 octane. Better mileage (is it worth it) at 91?

Thanks! This is a fun group.