swartlkk |
10-18-2020 01:00 PM |
The NV136 transfer case used in the 98+ s-series AWD Bravada was an electronic engagement tcase so it was in RWD mode most of the time, but did have a fully engaged front axle (i.e. no finicky front axle engagement system like it's Blazer/Jimmy siblings) so it did have some minor increased drag in the front axle over the 4wd brethren. When slip was detected, it would engage the front output auto-magically. I can't recall exactly what I used to get for mileage, but from what I remember it wasn't too far off from what other members with 4wd trucks were getting at the time. I do believe that the older AWD s-series trucks that used the BW4472/BW1372 had a higher parasitic drag due to the fulltime nature of the 30/70 F/R split they employed so they might have had a larger impact on mileage over the selectable 4wd optioned vehicles.
After the Bravada, I had an AWD Rainier & AWD Yukon Denali that I was able to get better fuel mileage across the board than the Bravada. The Yukon didn't do as well on long trips as the Rainier, but city it did about equal which is surprising given the almost 50% larger engine (6.2L v8 vs. 4.2L i6) and considerably larger vehicle overall.
All of this is my observation from my driving style. Your 'mileage' may vary. :icon_wink: I used to keep calendar books in each of my vehicles to keep track of all of my mileage & gallons of fuel pumped at fill ups to calculate out my mileage.
But I digress, we're getting a bit off thread topic.
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