@FIRST_LIGHT

Let me do some math:

google says:
1 U.S. dollar = 0.646454199 Euros
1 US gallon = 3.78541178 liters
$4/gal. -> 0,683 €/l
that's dam cheap.
Ok, the dollar is very weak right now, but even if I set $1 = €1, that's still about 1€ per liter.
We pay about 1,50 Euro per liter right now here in Germany. (That's $8,78 per gallon.)
Trend: rising prices. :-/

We measure the efficiency in liters per 100km.
Your car would be 22,6mpg -> 9,54km/l
That makes: 10,48l per 100km. That's very good I think. How much cylinder capacity does your gmc have? My car (Ford Focus) has a 1,6liter-machine, resulting in about 8l/100km.

@BMWs: If they sell the same machines in USA as in Germany, they are at about 9.5l/100km (for a BMW 335i) or 6,5l/100km (BMW 320i)

Your pickup can be compared to a BMW 740i which consumes about 11l/100km.
(numbers from bmw.de)

PS: when do you start using international units? Look at tha NASA, it works :P
http://en.wikipedia.org/wiki/International_System_of_Units