I use to think the same thing, before I bought one. The long legs on the freeway are really nice. 1750 RPM's at 80 and getting 18 MPG with less that 1K on the clock!!! 21 MPG at 65, what is not to like about the 3.42 gears. SNOKING
I am a little mixed on this. In my old truck with 3.73 (and the 5600) used to feel like I was above the engine's sweet spot when I got above 70 mph. With my new truck, I feel like I am barely getting into it at 80 mph. If I downshift to 5th it resembles the top gear in my old truck. When below 60 mph I sometimes force 5th as the top gear so it isn't rattling and isn't downshifting when I hit hills. The legs are too tall for 55-60 mph, great at 70+.