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40 mpg Highway on a diesel? That doesn't sound right at all.
2014 Gen I 2.0 diesel with 68,000 miles, I just drove 250 miles across the California desert today in 105 degree heat and AC blasting, recorded 51.1 mpg at 60 mph (would've been better if not for a 15 mph headwind).
Even if I was doing 70-75, mileage would've been about 45-46 mpg. While AC does load the motor and reduces fuel efficiency, I've found (on the Gen 1 diesel anyway) AC doesn't have as much impact as wind, terrain and city driving.
2014 Gen I 2.0 diesel with 68,000 miles, I just drove 250 miles across the California desert today in 105 degree heat and AC blasting, recorded 51.1 mpg at 60 mph (would've been better if not for a 15 mph headwind).
Even if I was doing 70-75, mileage would've been about 45-46 mpg. While AC does load the motor and reduces fuel efficiency, I've found (on the Gen 1 diesel anyway) AC doesn't have as much impact as wind, terrain and city driving.
