With around town driving, your engine and tranny are working much less so mileage seems to be better. On the highway you're turning more rpms so mileage will suffer a bit. But honestly I haven't noticed much difference.
I went from 3.73 to 4.56 and didn't look back.
I drive around town once a week just to keep things fresh, but it never sees the freeway unless it's hauling a load.
Regearing for the purpose of towing can be a good idea. The other upgrades mentioned can add lots of performance to your rig, but according to specs, stepping up in gears alone can often add 1000 pounds to your capacity. My 05 Yukon came with the tow package with the small tranny cooler and 3.73...
First I'd like to thank you all for the hours of information that you've all contributed to. I belong to several forums for the types of vehicles I own and am a firm believer in searching out the posts before adding another question. But since I haven't been able to find it, here goes.
I...
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