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2021 Scat Pack R/T
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These are overall hand calculated mpg for my 3 vehicles.
2021 Grand Cherokee Limited X 3.6 V6 20.05 using regular 12K miles
2021 Challenger R/T Scat Pack 19.23 using premium 12K miles
2022 Wrangler 2 Door WILLYS 2.0L Turbo I4 20.65 using premium 7.5K miles
 

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2021 Scat Pack R/T
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260 Posts
Those MPG numbers are closer than I would expect given the differences in displacement.

The V8 Mustang engine was 4.6l. The V6 Mustang engine was 3.8l. Just 0.8l smaller.

The Scat Pack V8 is 6.4l and the GC V6 engine is 3.6l. That's a 2.8l difference.

But I note the GC has full time 4WD. And weighs in at 4700+ lbs vs. 4200+ lbs for the Scat Pack though this is probably with the 6-speed manual.
I know it's interesting the mileage is similar for all 3 of these vehicles.

Here are the shipping weights from the MSO of each of my 3 vehicles.

2021 Grand Cherokee 3.6 V6 AWD: 4,592 lbs
2021 Challenger Scat Pack w/A8 transmission: 4,146 lbs
2022 Wrangler Willys 2 door 2.0L: 3,874 lbs
 
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