Quote:
Originally Posted by gnorthern
I keep reading about these Indian Scorpios with the 2.2 liter engine that weigh over 1000 pounds more then the TR's, have a 5 speed manual, and get 22 mpg city and 29 highway. Will all of this urea kill the fuel efficiency or can we expect 25 mpg city and 31 highway?
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It's not the urea per se', it's the emissions control system in general. The quick answer is that M&M isn't saying, so we'll all keep working the beads until they do.
A somewhat longer answer is that the DEF systems have helped raise fuel mileage over the previous method of heavy EGR regulation in the big trucks, but overall it's probably lower by some amount then the pre-emissions days.
Overall I'd bet that it's not a lot lower because even though the older trucks (like mine) have no EGR or catalysts, their fuel delivery systems weren't nearly as precise as modern systems... they didn't need to be, and the ("old") cheap way to make power on a diesel is to throw more fuel at it (other systems being modded accordingly)
-pete