Bruce Amacker Posted November 11, 2010 Share Posted November 11, 2010 FYI: I had a meeting with a large gov't fleet customer Monday who enlightened me on some numbers he's seeing. Vehicle is a SCR equipped Cummins powered city transit bus, quantity 4. DEF usage among these 4 buses is 28 miles per quart- that's 112 miles per gallon! He's going through drums of DEF at an alarming rate. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted November 11, 2010 Share Posted November 11, 2010 I know the F650/750 have larger tanks for this reason but since you put this as "miles per gallon" it seems a little high... but is this normal? The larger tanks as I read it were to accommodate higher operating loads, idle time typical of the medium trucks and the longer oil change intervals as compared to the light duty trucks. Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted November 11, 2010 Author Share Posted November 11, 2010 I know the F650/750 have larger tanks for this reason but since you put this as "miles per gallon" it seems a little high... but is this normal? The larger tanks as I read it were to accommodate higher operating loads, idle time typical of the medium trucks and the longer oil change intervals as compared to the light duty trucks. Shouldn't idle time have very little effect on DEF usage? NOx is only produced under high load levels, I'd think DEF usage would be zero even in long idle time situations. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted November 11, 2010 Share Posted November 11, 2010 Idle time wont affect NOx like you said but it does factor into fuel economy and service intervals... perhaps I shoulda left dat out considering the topic... Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted November 12, 2010 Author Share Posted November 12, 2010 I cudda swore I clicked "Diesel Engines" for the forum. Ooops. Quote Link to comment Share on other sites More sharing options...
Jim Warman Posted November 14, 2010 Share Posted November 14, 2010 I can't speak for other engines, but I came across this on PTS... Quote Link to comment Share on other sites More sharing options...
joshbuys Posted November 14, 2010 Share Posted November 14, 2010 Excellent find Jim, Thank You!!!! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.