Выдержка из Owners Manual Escalade 2015+ на тему топлива :
"Fuel
Use of the recommended fuel is an
important part of the proper
maintenance of this vehicle. When
driving in the U.S. and Canada, to
help keep the engine clean and
maintain optimum vehicle
performance, we recommend using
TOP TIER Detergent Gasolines.
See www.toptiergas.com for a list of
TOP TIER Detergent Gasolines.
Use premium unleaded gasoline
meeting ASTM specification D4814
with a posted octane rating of 91 or
higher. Regular unleaded gasoline
rated at 87 octane or higher can be
used, but acceleration and fuel
economy will be reduced, and an
audible knocking noise may be
heard. If this occurs, use a gasoline
rated at 91 octane or higher as soon
as possible. Otherwise, the engine
could be damaged."
octane rating в тексте как надеюсь понятно это AKI, а не RON.
А разные ультимейты, те что в России продают, близко не соответствуют требованиям TOP TIER Detergent Gasolines.