I just got the extension yesterday so this was just the regular 3oz can that was nearly filled. We had a few cooler morning drives, one trip with 16ft trailer with 20 sheets of osb and lumber. Honestly I'd say a couple hundred miles is all it was driven. No idle to speak of and no remote start. I'm going to keep better track of mileage now because I was expecting less fluid since the temps are warming up. This is on a '19 with 8,000 miles.
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That does seem like a lot based on it sounds like your use. Keep us posted.
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