Mine does the same thing. I just bought my 2006 with the 4.7 and this is the first V8 car I have driven in quite a while. I dont recall any of my 4cyl cars doing this.. but from what I have read this is completely normal.
Great looking truck! Love the white! I just bought an 06 Limited V8. Very new to the T4R's... tell me about this Christmas tree dash lights and what you replaced them with?