I've seen a similar drop in mileage. I attribute that to the car that longer to warmup and thereby using more fuel during that this period. With my cars I generally see the best mileage when the mornings are warm and the afternoon is not hot enough requiring AC. Once the AC is on and it get real hot mileage drops.
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03 Carrera
02 Boxster S Guards Red, black interior with matching hardtop
89 Carrera 4
89 944 S2
78 911SC
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