What is optimum AFR for peak power using LPG?

[LPGC]

If you're finding a rich mixture gives a lot more power (and you need that power) it seems you'd either need to ditch the 175 closed loop setup or experiment with a wideband to narrowband interface as per Rob's info in post #16... Or fit a V8 in place of the 2&1/4.

[Gilbertd]

Thinking about this and the options that are available in the Leo, it might be possible to do it. If you can frig your TPS to give maximum at foot to the floor, you can then use the full throttle option to set the actuator opening at a richer than default opening. It won't be relevant to revs but to throttle position.

[CNG]

Thanks to you both, I've come to the conclusion it'd be a fair faff - with trade-offs such that there's no guarantee of real-world gains for the effort. I like it, currently it works well, I'm up on the deal. I'll leave 'as is'.