JHarris - Welcome to my commute nightmare (45 miles & 1-3 hours each way, prolly why I've become such a procrastinator).

"So maybe I will deraise (lower it to stock) and see if there is much of an increase in mpg."

Lowering your vehicle won't help with gas mileage unless you put whimpy rubber on to match. Lifts are almost always accompanied by taller & more agressive tires. That's what kills your mileage. The taller tires effectively lowers your gear ratio & the more agressive tread increases the rolling friction. The only thing lowering the vehicle will do is MAYBE increase your aerodynamics & MAYBE decrease the friction at the CV joints (neither will be measurable differences). IMHO - it would be a waste of time.