I only have 500 miles on my SRT, and have only done one highway trip that was 153 miles long. The 6.1 used 6.5 gallons of gas to go those 153 miles, which by my math equals 23.5 mpg. The onboard computer said my average fuel economy was 22.4 mpg. I am happy with the fuel mileage the SRT is getting so far.

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