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Message: <blockquote data-quote="CocoaJeff" data-source="post: 31982" data-attributes="member: 7833">"70 mph is 2200 rpm. 8th gear is 1800 @ 70 mph" - GaryM"It's programmed to do what's necessary. 8th gear isn't often needed." - 2025ChevNoxThat's a pretty substantial difference in rpm.  I guess I don't understand why it WOULDN'T automatically use 8th gear every time at 70mph?  Why would the system be programmed to stay in 7th at a higher rpm, when 1800 rpm would seem to be better for the engine, and mileage?</blockquote>