Ford Focus Forum, Ford Focus ST Forum - View Single Post - Regular Unleaded Gas (stock) vs Premium Unleaded Gas (tuned)
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Old 03-27-2012, 09:19 AM   #45
1turbofocus
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I dont agree , the ECU is very smart and if it sees no knock the ECU can add in timing all on its own , so if your focus runs 87 and you add 93 you can get a good bit of use out of the 93 fuel both in mpg and performance , it isnt like to old carb / set timing days

The ECU under part throttle and cruise can add fuel as well so both timing and fuel can be added/removed all on its own

Tom
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