your idle is going to be lean. No point in burning fuel up at idle when the motor is in no danger of going boom. Cruise seems to be set up for fuel consumption. Dead on stoich gives great gas mileage. Cruise the car and then take a big hill without down shifting and see what that does to the afr's. If your wot afr's are around 12 I'd say you have a pretty good tune.
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Leaky injector is basically a pintle that is stuck open due to carbon or nasty stuff. Sometimes they don't stick open, they just don't shut all of the way and leak extra fuel into the cylinder. Tell tale sign is a long hard start.