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I noticed my 12 seemed to get the best gas mileage around 75-80 and not using the cruise, but gently press the gas going up hills so the rpms dont jump up. I have never tried turning the ECO mode on/off though, may need to give that a try. Heade on a road trip this weekend, but I will be trading mine in for a 14 this week, so a nice long road trip to break in the new ride.

I never use the Parking Brake, except to hang air freshners from, lol.
 
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