Peak Blue DEF from Wally World. At 1/2 on the gauge or a little lower it will take the 2.5 gal box. SNOKING
That's what I do....buy a 2.5 gallon jug right at 1/2.
FYI--- the nozzle from the 2.5gal DEF jugs fits perfectly on the Power Service diesel additives... works great to get around those dual flapper thingers on the fuel tank
I also get my DEF at truck stops, bulk is cheaper by about 25-30%, and fresher by far
-j
I put in a box of peak today that I bought in Mountain Home, I'd a couple days ago. If I go a little below half on the gauge I know the 2.5 gals will go in without spillage. I am at 1240 miles since topping off with a box at home. So I am using 1 gal per 400-500 miles at 25k combine weight with a tall 5th wheel. Averaging about 10.7 MPG for diesel. Up and down mountain passes and at 7000+ feet today back down to 2000' and now back up to 3700. SNOKING