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So we were fortunate to buy one of the new 3.0 diesels in early 2020. We enjoyed that GMC denali for the last few years but with all our long distance driving between our kids/home, it was reaching 100k miles and I read great things about the updated 3.0 (LZ0) and decided to trade in our 2020 and get a 2024 ZR2 Bison with the 3.0.  

For the last week we have been breaking the new truck in and driving across country.  We were very used to the DEF usage on our 2020 and with a 1000mile trip we’d normally (not towing) see about 2 blips down on the DEF guage.  However with the new truck, we are seeing significantly more DEF usage on basically the same trip (more than half way down) so we are kind of surprised.   I know Ive read of other owners who had the original 3.0 diesels engine and traded up to the new LZ0 one, so what has been your experience?  Love to hear feedback?? Thanks!

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I don't have first hand experience with the diesel but some food for thought is that the emissions standards between 2020 and 2024 are possibly different and or that GM is a little ahead of the curve for changing standards and they want to meet those new requirements. So that way they stay compliant in the states that really crack down on testing. Also the ZR2 bison will make the truck work harder to do the same thing compared to your old truck. A lifted truck with heavy duty tires is causing more DEF usage.

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