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I think 20mpg is realistic since you have the 4.8L engine, but not with any city driving. That 4800# is a lot of iron to get moving from a dead stop. Given the percentage of your commute that's city driving, you're doing pretty dang well. I have a 98 with a 5.7 and I'm thrilled when I can get it over 17mpg (which only happens on highway tanks). Then again, I haven't filled it up in over a month since it's our third vehicle. When we do drive it, it's loaded with weight or it's deep snow. Sadly, the best thing you could do to save gas is pick up a used Metro/Civic/Prius for your commute. Obviously I have no clue why you drive a truck, so it may not be an option, but if it is, it'd probably save you $800/year in fuel.
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