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Old 11-28-2014, 10:26 PM
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EVIC GAS Mileage

I have been watching my gas mileage since recently buying a 2014 JCG. I was interested in the difference in mileage over a long trip versus a shorter trip. I decided to use Trip A to monitor the mileage from tank to tank and leave the "regular" average alone to average over many tanks. The only thing is that the "regular" average stays pretty close to the trip average most of the time even when the "regular" average has both highway and city and the trip average is mostly highway. What this tells me is that the regular average has a sliding window average and not a true average over multiple tanks. I have also noticed that if I coast down hills to improve mileage both averages can be changed a lot more than I expect based on the length of the hill. (e.g. the average can increase 0.1mpg going 1/2 mile coasting even though the average should be over several hundreds of miles where coasting 1/2 mile should have no effect). This also indicates a sliding window average for both the regular average and the trip average.
Has anyone else observed this?

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Old 11-28-2014, 11:28 PM
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Re: EVIC GAS Mileage

The trip average is the average since the last reset on that trip memory or the last 300 miles, whichever is less. The overall average is based upon the last 300 miles. It would be nice if it were based upon the last reset, but that's the way Jeep designed it. I used to set my Tahoe overall average on January 1 to show the average for the year and use the trip memories for various trips. There was often quite a variance in the overall average and an individual trip that had a lot of highway driving and no towing.
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