From what I have heard the cylinder shut down feature does not improve mileage as much as they said it would. I don't know why Toyota would even offer the 4.7 for the 07 Tundra in anything other than the regular cab 2WD version and as mentioned for an extra $1200.00 it's a no brainer, more power and the same or even better mileage with the 5.7. As far as the 5 speed 4.7 versus the 6 speed in the 5.7 version I suppose it might make a difference but I think more so that the 4.7 just has to work harder in a new truck weighing 1000 LBS more than the older version. Actualy if comparing the older Tundras 00-04 models with the 4 speed to the newer 05-06 VVTi models with the 5 speed, from what I've seen it made pretty much no improvement in mileage over the older 4 speeds, infact it looks to me like the older 4 speed versions were actualy even a little better on fuel if anything.
