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I am not saying I am in the same ball park, but when I first got my '14 2lt , the mpg slowly went down a lot..... like initial full tank was around 440 mile.... then after a while it was 379-400... and this was on 87 octane... and at the time I was delivering pizzas.. and this was all from may 2 of last year till this past march... and insert a change of jobs, and one drive into work and home of about 25 miles. And slowly my full tank went back up to 480 miles per tank on 87 octane... then I started using some 93 octane and bam!!!! I am over 500 per tank... I will say as with any car, short trips or stop n go trips are the worst for mpg

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