Quote:
|
Originally Posted by MBeige
Thanks, I don't think a differential swap is practical (financially) any time soon. I too keep records of my fuel economy on my receipts. My 300D runs 80mph at roughly 3800rpm. 75mph at roughly 3500rpm. So I'm guessing 70mph will run at 3250rpm and 65mph around 3000rpm.
Won't a drop in RPM result in a loss of power? Here goes the balance between power and fuel economy... 
Thanks again |
Torque drops as RPMs rise, you want to drive in the torque band.
I have a dyno plot that someone ran a 300D a while back... it was around 85rwhp/155rwtq.
It's slower at 65-70 than 80mph, but give it a shot for one tank of fuel. If it works great. If not, happy speeding.
But not only are you running at higher RPMs drag is against you the fast you go, causing you to use many times more fuel than you would at slower speeds.