Posted by 4play on February 24, 2020 at 19:39:34 from (12.235.184.17):
In Reply to: Cummings engine ? posted by gordy from iowa on February 24, 2020 at 13:26:36:
DEF consumption somewhat follows fuel consumption, but its more dependent on engine load. Pulling heavy loads at constant high speed is what will use the most DEF. No load and/or slow speed driving will not use much DEF. DEF reduces NOx emissions, NOx is produced more with higher combustion temps (heavy load), easy driving doesn't create high combustion temps, so DEF usage will be minimal. If the average is 2-3% , some people might be 0.5% or less, some might be 5% or more.
I think the higher averages use around 1 gal of DEF every 900-1100 miles, towing heavy can cut that in half or more. These trucks have accurate DEF gauges but they are not linear like most fuel gauges, they seem to spend a lot of time around 100% mark before dropping below 75% or so.
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