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Fuel milage

Phantom 4D
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Phantom 4D Enthusiast

Phantom 4D

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Took my 2023 Sierra SLT 3.0 diesel on it's first long trip. Up until last weekend, the longest round trip was about 250 miles. This one was a total of 619 which included milage at the destination. Down and back was all interstate. Milage down was 32.2. When we got back home the readout showed 619 miles, 29.2 MPG average 60 MPH. I ran the tank down to empty. When I filled it it took a bit over 21 gallons. We did hit a lot of stop and go traffic on the return trip.  Oh, and the range showed 63 miles left when I filled up.  I don't go by the range milage as that depends on too many factors. 

Overall, I am very pleased with the performance and comfort. In a few weeks It will get a workout with a trip from home to PA to De and back home. 

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