Yukon Fuel Economy without Auto Start/Stop

ruise

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Without automatic engine stop-start, the standard-length 2021 GMC Yukon loses 1 mpg city and 1 mpg combined when equipped with the naturally aspirated 5.3L V8 L84, including both rear-wheel drive and four-wheel drive configurations. The feature’s absence also leads to a 1-mpg decrease in the city and combined when equipped with the naturally aspirated 6.2L V8 L87 and rear-wheel drive, while models with the L87 and four-wheel drive lose 1 mpg combined.


The 2021 GMC Yukon is also offered with the 3.0L I6 LM2 turbodiesel Duramax, which continues to come equipped with automatic engine stop-start. All three engines mate to a 10-speed automatic transmission.
 

robgreg75

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Maybe in nice weather when you have the windows down and the a/c off. It is summer time in Texas and mine doesn't shut off at all now that it is 90+ degrees out.
 

waynehead99

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Personally I find these numbers hard to prove when it comes to the start/stop feature on these newer cars. There are too many variables to consider. Temperature outside vs inside for climate control, state of the battery. 1 MPG sounds like a default answer from gubment bean counters for CAFE credits vs a reality.
 

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