Join Date: May 2012
Location: Mahwah, NJ
2013 Sonata replaced by: 2014 Azera Limited with Premium - Porcelain White w/Black interior
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I just did the second half of a long drive(Houston, TX to St. Louis).
On the way down a month ago I drove with the eco off. Average speed of 70mph(per the trip computer). Usual real speed was 75mph with lots of slower areas hence leading to the 70mph average. Got 34.5mpg on the trip computer(I think it was like ~32 calculated).
On the way back yesterday I drove the whole way with ECO mode on. I did 70 actual for about 4 hours between Houston and Dallas and was seeing 37.3mpg on the computer. North of Dallas all the way to St. Louis I was doing 75mph(again with some parts going through towns where you have to slow down) and average speed was again right at 70mph on the trip computer. I got 36.3 on the computer.
So roughly a 2mpg gain(per the trip computer) on the exact same route doing the exact same speed. You could call it maybe 1.5mpg difference to take some errors in my driving style out of the equation. So in one tank of gas that would be about 28-36 miles more. So IMO not that great of a change, but on a long trip I will for sure be using ECO mode again.
But I wonder what it really does at highway cruising speeds if all it really does is temper throttle at acceleration?
if anyone is willing to test this out and drive the same route one way with ECO ON and the other with ECO OFF, and post the results I think everyone could benefit. Please use the same speed with cruise control, however.
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