The ones on our 136k mile 2001 4.0L Cherokee XJ are original, and of the one-hole type (I keep thinking we're talking about a privy: one-hole, four-hole . .) and I have been reading on upgrading to the EV-6 type. Thanks for the above discussion as it hasn't been clear on the Jeep boards if a solid mpg gain was being seen. Maybe is different than confirmed.
Smoothness alone is worth it to me, and of necessary help on the slightly rough XJ idle to keep the diagnostic tree shorter when problem-solving. This looks like a no-brainer to order up some new type Bosch injectors.
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