[serialk11r]

1ZZ owner here, let's clear up a few things.

No, fuel enrichment does not happen on this engine at 4k. It kicks in at something like 4500, before that it's stoichiometric closed loop.

3000rpm is highest efficiency at max load but the way it typically works out is that at lower loads you're better off at slightly lower rpms since friction is more correlated to rpm than load. I wouldn't be too concerned with acceleration on this engine because it doesn't enrich the mix at low rpm, just give the pedal a solid push and you'll be at a good load level to be using the engine efficiently and focus on everything else.

Also if you want an all out economy cam grind, you can have a high duration low lift intake cam at the expense of torque. Cost is 200 bucks from delta cam, not really worth it unless you drive an insane amount of miles or you're looking for more top end power or something.