I'm only on my first full tank since the delete, but I'm noticing my mileage hasn't really changed. That's with 160 mile highway trip. And yes, Justintoxicated, it is logical to expect the engine to use more fuel when it's drawing more air to keep the A:F where it should be.
Current- 2016 Race Red Focus ST1
Traded In - Sedan Revolution #249 - 2012 SE Sport - ╠╬╝ - Ingot Silver - 201A - K&N w/ snorkel delete - Blox Type R Knob