better fuel mileage?

[Piersol]

I love my "new" 2005 quad cab HO with 20,000 miles. Nice improvement in HP over my 1996 with a #8 plate but i am a little dissapointed with mileage. Empty my computer says I get 17. 4 mpg 70% hwy and 30% city. Actual mileage is 15. 5. My 1996 got 17. 4 actual. I know I have way more power than my '96 so I have to expect some tradeoff. I find that I have more than enough power but I would like to see 25 mpg hwy and 20 city. My friend has an Excursion and he says with his "chip" he gets 30mpg Hwy (seems unrealistic but. . ). My question is can any of these "gizmos" get me 25 mpg hwy?

 

[SBeretz]

I would guess 25 MPG would be possible with 3. 73's and the auto (lower overall gear ratio) and driving 50MPH. Your buddy getting 30MPG out of an Excursion sounds a little hard to believe. I would hope your truck driving it modestly (not over 65) would net you right around 20MPG HWY. Others will chime in on this. But 20MPG out of a heavy truck like this is pretty good. 25 might be a bridge too far. Scotty