what kind of mileage u get on the 420? I heard of sometimes bigger engine burn less fuel.

I had a 300se before, the engine seems to rev a lot too. becareful to drop the 2.47 into the 300se, u could be loading/lugging the trans too much as u dont have to spin as fast.
I do have a 420 now, is much quieter , nicer, only draw back is going thru gas like no tomorrow. I also have a 190e 2.3 dont think is all that frugal on gas either.
The 300sd is the cheapest to run. As I use the combo oil.
I u really want to save gas, go get a diesel and burn atf /veggie oil.

Funny the modern day 560 v8 put out as much power as the old 6.3 v8 ( 250 HP approx )
and on my bro's 98 e320 it puts out 215 HP is as much as my 420 now!

the newer 500 puts out 322HP with 4 valves, newer ones is little less no a big difference.

V 12 were 389 HP, and a new sl 55 is almost that nowadays.

__________________