Over the past few months I’ve noticed my gas mileage decrease from 29 MPG to 27 MPG. My RX has 5000 miles on it, and this reduction in fuel economy exists before and after the first oil change. After the first tank full with reduced gas mileage I noticed a sticker on the gas pump stating Contains up to 10% ethanol. I exclusively use 93 octane fuel as I consistently get better gas mileage over the 91 octane. I live in South Florida and it has been warm here for a while, so the air conditioner has been running all along. I know there are a lot of factors, just curious if anyone else has noticed this. I can't complain about 27 MPG as my driving pattern includes 20 miles on I95 at south florida I95 speeds 5 days a week.
