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On our way to and from Florida we are on the interstates at 62/65 MPH and we will normally get two regens in the 1200 miles trip. They are active regenerations were fuel is sprayed into the filter and ignited which causes the MPG to decrease and the EGT temps to go up. If on a fairly level road when towing I may not be able to feel it going into regen but I can always see the EGT's go up and can see how long the regen last. If we have been at say 10MPG we will drop to 7 while in regen. You can just about set your watch that it will take 20 mins.
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