I guess I'm still used to driving a stick...I use D4 D3 2 1 every day, it is extremely helpful in the city where the tranny can't see traffic lights. I cross the paths of 15 stop signs or traffic lights on my way to the train station, which is exactly 2.7 miles from my house. If you do the math, you see that some of them are bound to be quite close together. I counted that when I leave it in D4, in the worst case scenario the tranny does 42 up or down shifts in 2.7 miles. When I have my way, and usually I do, it only does 1 shift on the way to the station - the 1-2 upshift. On the way back, it's all uphill, so it has to shift a few more times. Still that's a lot of wear on the clutch packs that you could be saving.
I take off from one light and I can already see the next one is red and not changing anytime soon - that's when you use 1. I use 2 all the way to the station (all downhill so it pulls fine off the line in 2nd) instead of having it do the 1-2 and 2-1 shift so many times (2nd gear clutch pack has issues on my tranny, less I use it, less likely to fail). I use D3 on local highways where the speed limit is 40. It prevents a shift into 4th, again when there's so many traffic lights its just unnecessary. It's also useful when you take off from a light and you're going to be getting onto an onramp. It might shift into 4th, then you'd brake for the onramp and get back on the gas and it would just shift back into 3rd again anyway. You could just leave it in 3rd and let it rev a bit higher for a little while (or go slower like I do) and prevent that unnecessary shift.
And I have to do all this with the column shifter on the Ody :banana: