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That's not how it works. I have my vtec set to 3600 and it only comes on when throttle position or manifold pressure is above X. Last tank of gas I got over 500kms before the gas light turned on... and that included Niagara cruise
I have my vtec engagement set to 3900 at WOT and vtec on regardless beyond 5600 I think. If you're not sure about the 2nd number, get the flashpro app running and sit around 5/6k partial throttle (maybe higher)