I know this has been beaten to death in other threads, and I did look through hours worth of threads to try to find someone who already answered my question, but found nothing. I see HP and Torque ratings are based on using 93 octane. I was planning on running at least 91 octane in my vehicle when I purchased it. I asked the service manager about it at my local Ford dealer (where I purchased the vehicle.) He told me NOT to run anything besides 87 octane, that anything higher octane burns more slowly and leaves deposits in parts of the intake/fuel system. I looked on the forums and see many posted scripture from their owners manuals for the 2013 escape that said it was ok to run higher octane for better performance and towing purposes. I then reference my owners manual and in the 2015 manual it specifically calls for 87 octane with no mention anywhere of being able to run higher octane for any reason, for performance or towing purposes. I feel like if I ran higher octane and something happened even if it wasn't because of running higher octane, the dealer would put the blame on me for doing so, especially because the manual would not back me either like it apparently did in earlier model years. Anyone have any advice?