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We present revised and improved mid-infrared Period-Luminosity (PL) relationsfor Large Magellanic Cloud (LMC) Cepheids based on double-epoch data of 70Cepheids observed by Spitzer at 3.6, 4.5, 5.8 and 8.0um. The observed scatterat all wavelengths is found to decrease from +/-0.17 mag to +/-0.14 mag, whichis fully consistent with the prediction that the total scatter is made up ofroughly equal contributions from random sampling of the light curve andnearly-uniform samplings of stars across the instability strip. It iscalculated that the Cepheids in this sample have a full amplitude of about 0.4mag and that their fully-sampled, time-averaged magnitudes should eventuallyreveal mid-infrared PL relations that each have intrinsic scatter at most atthe +/-0.12 mag level, and as low as +/-0.08 mag after correcting for the tiltof the LMC.

The Cepheid Period-Luminosity Relation at Mid-Infrared Wavelengths: II. Second-Epoch LMC Data