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Have you read the owner’s manual to the ES350? It probably states that you can run 87 octane fuel, but to expect lower
performance. What you should do is run several tanks of 87 octane fuel (run two tanks with Techron initially), and on the last couple of tanks calculate your fuel cost per mile. Then switch back to high octane fuel and calculate your fuel cost per mile. If 87 octane runs the car fine, and if your fuel cost per mile is lower, and if the owner’s manual says that it’s OK to run 87 octane, then run
87 octane. If the car manual says you have an option to use either Regular or Premium “for added performance” you have to do the two tests, running Regular and then Premium over at least a dozen tankfuls of fuel each, and then do your math. To get consistent results try to use the cruise control as much as possible, so it’s driven the same both ways. On some cars the extra performance from running Premium fuel increases the fuel mileage enough (when driven the same) to actually lower the cost per mile. On many cars it’s a wash ? the added mileage
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