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Message: <blockquote data-quote="Marky Dissod" data-source="post: 28745" data-attributes="member: 13218">Don't take this personally, but I'm surprised this is still a question after over 25 years.That more GM V8 vehicles have not been tuned - even if NOT for more power / torque / throttle response! - is a failure on several fronts;clearly most people misunderstand how the GM OE 'tune' holds their vehicles back in terms of durability / longevity, nevermind power / torque / throttle response.Even if you stick with 87 octane, you will gain some power - my guess based on experience, about 10-15 ft lbs from 1800RpM up.Have a more detailed discussion with your tuner about the DuraMax; power / torque / MpG gains should be balanced against powertrain durability.More importantly, engine and transmission throttle response will quicken noticeably, and they'll both tend to run cooler and last longer (unless you abuse it).Get the Yukon tuned first. You'll immediately regret waiting so long. Results will be even more obvious on the 6.0L trucks.Although getting the LBZ tuned might cost a bit more, it MAY pay for itself over time, so long as your right foot behaves.</blockquote>