driving in 4 will dramatically decrease in mileage. But ehy are you consirned about mileage in 4 wheel??? The only time you should be in 4hi is when you actually NEED 4hi. And when you need it....why do you care if your truck is getting 14mpg? 13mpg? Honestly don't know the numbers....as i don't care. And neither should you.
ways to improve: intake, exhaust, tuner, a "light right foot", tonneau/canopy, watching your weight, your vehicle weight(keeping inside pretty much empty). Maybe swapping down to a 3.73 gear ratio.
There mores ways but that's what came to mind.
'01 XLT disguised as a '03 Fx4 Level II
Big. Loud. Slow. Bright.
Last edited by Fx4wannabe01; 01-07-2008 at 09:17 AM.