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I agree with Tsloper.
As you get miles on the car everything losens up and friction is reduced so mileage will climb slightly with miles up to about 10,000 miles.
My personal truck gained 2 MPG all be it Poor to begin with 10MPG city now with 24K miles gets 12 MPG City.
Manufacturers today are not leaving anything on the table for fuel economy gains in the tuning or with parts.
And Don't hold the DIC (digital instrument cluster) as gospel, Hand calculate in order to get the most accurate numbers.
Aftermarket parts can Fool the DIC average MPG, We seen this exaderation in the Diesel industry, add a tuner and gain 4 mpg LOL, hand calculate and you gained nothing to 1 MPG.
The largest effect on fuel economy is the driver, I get 3 MPG better than my wife in the same car.
Then there is terrain the flatter the ride the better the mileage, ever notice you get better mileage one way vs the other on the same trip.
I can tell you in back to back driving the same trip with my ZL-1 and my 16 SS the 16 SS gets about 3 MPG better city and 6 MPG better highway.
Ted.
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