Uh....anyone else getting 21MPG?

I just changed my front O2 sensor this weekend, picked up a little over 2 MPG. I'm happy, if I could keep my foot out of it I expect it will do even better.
 
3 hour highway drive on monday and I averaged 22.5 mpg.. Lifted, supercharged, 33" duratracs, loaded with gear.

Oh and it was with ethanol-free gas..


The trip up there a few weeks ago was 18.5 or something on regular pump premium with 10%.
 
How big is the reserve? Reason I ask is I always fill up right when the low fuel light is a solid yellow and the most I can ever seem to put in the tank is about 14.5 gallons...I'm pretty sure a full tank is somewhere around 18 gallons? I guess I'm just leery of running out of gas, usually fill up when the trip meter is around 270 mi.

I averaged 19.5 mpg on a 1600+ mi trip from PA to TX recently, with a trunk full of stuff and also set on cruise control at 70-75 most of the way...also had to use 4WD a couple of times in western VA and TN when traffic was slowed down because of the snow.
 

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