Another thing to consider is that several of us on the forum have discovered badly scored, or worn, cam lobes when we've taken our Element in for a valve adjustment so there's that to consider also. Get them valves adjusted.
Well.... if that's not enough let me add another story:
I was skeptical of all this rhetoric about valve adjustment even though I was suffering the classic "Stalls when Cold" symptoms (not 'cold outside' but engine cold).
Changed the spark plugs and the coil packs and still cold stalling. Read & read & read... finally took it in and had the oil changed and valves adjusted.
Needless to say, the cold stalls went away and the fuel mileage went up 2mpg.
I was driving a minimum of 500 highway miles / week at the time and had been for two years.I track my mileage by recording the tank fill volume from the pump and my odometer mileage. I figure that the numerous data points I have from doing it at all outweighs the error in the methodology. The 2mpg improvement showed up immediately and stayed consistent for months afterward, now I don't drive but a couple hundred miles a month and all around town, so my overall mileage is down some.
Needless to say, I think that the benefit is so great that I plan on having it done every 50,000 miles now.
Bottom line... GET YOUR VALVES ADJUSTED.