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- #201
Yeah KCLV is somewhere in the 14-18 range IIRC when I was watching it before. I’ve just never quite understood the actual impact.
It's a global correction factor for timing advance. Historically, Toyota engines will start with a baseline correction around 15 KCLV. It will very slowly walk that value upwards as a timing advance factor, inching closer to the knock threshold. It's a longer term variable used optimize power and fuel efficiency, while compensating for engine health, environmental conditions, and/or fuel quality. It'll creep upwards very slowly but will retract quickly with any sign of knock. It's part of why they say not to switch between octanes regularly as the engine has to re-learn to take advantage of more octane, or will experience knock when going back to a lower octane.
Towing is some of the most stressful use cases for an engine as it operates at high outputs for extended periods, with lots of heat saturation. It's where octane makes the most difference, and can be beneficial to cover for other factors.
Not saying it will definitely make a difference and will depend, but you might entertain some simple maintenance - clean the throttle body and use Seafoam through the intake track and fuel system. This can often wake up an engine and has shown to have benefits to KCLV. You might be able to get some performance back with 87.