DEF Tank & MPG
I have a 2020 Magnitude SV34. I typically get 9.5 - 10.5 MPG towing and get well over 500 miles per fill-up. I have gone 7 - 10 full-ups before adding DEF. I have not gotten to a low DEF condition yet so I’ve had room to spare.
That puts me well over 500 MPG of DEF or so. I’m at the point I don’t worry about DEF. I don’t even carry it with me.
I think I remember reading in the Ford manual that a full tank of DEF should be able to last until the computer calls for an oil change or so.
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