Fuel Economy Update for April - 2014 Chevrolet Silverado 1500 Z71 LT Crew Long-Term Road Test
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2014 Chevrolet Silverado 1500 Z71 LT Crew Long-Term Road Test

2014 Chevrolet Silverado 1500: Fuel Economy Update for April

May 9, 2014

2014 Chevrolet Silverado 1500

Eight months ago I tallied up the first monthly fuel economy update for our then-new 2014 Chevrolet Silverado. After 6 weeks and 5,146 miles it had averaged 17.6 mpg.

At the time I supposed that with time and miles our average might edge closer to the truck's 19 mpg EPA Combined rating. Someone would get more than 500 miles out of a single tank. One or more of us would exceed the Silverado's 23 mpg EPA Highway rating.

Two out of three ain't bad, but here at 20,417 miles (yes, this is a 20,000-mile update, too) we've only achieved one out of three. And we narrowly missed a big fat goose egg by the thinnest of margins.

Early in this reporting period — April 1, to be exact — someone managed 23.1 mpg, the only tank that has so far beat the highway rating. But it was only a 211.9-mile run, not even half a tank. It's hard to know if the driver could have sustained that level of thriftiness over the course of a really long driving leg.

If they had made the attempt they would have certainly driven farther than the 469.2-mile single-tank maximum we logged 8 months ago. But they didn't, and neither has anyone else, so that early mark still stands. But that's not to say it's impossible. No driver has added more than 23.6 gallons to the Silverado's 26-gallon tank and most road-trip fills amounted to 21 or 22 gallons. Perhaps bladder size is a larger factor than tank size.

As for our running average, it actually decreased from 17.6 to 17.5 mpg in the intervening 8 months and 15,000 miles. We're actually a wee bit farther away from 19 mpg combined than we were back then.

Why are we falling short, if only by a single mpg or so? It probably has to do with the optional 3.42-to-1 axle our axle ratio is equipped with. The standard ratio, the one that has more to do with the EPA fuel economy ratings, is 3.23-to-1, some 5.6 percent taller.

In isolation, however, this month has been a good one. The 2,798 miles we added in April came at an average of 18.7 mpg, which does in fact, round up to 19 mpg combined.

Worst Fill MPG: 12.5
Best Fill MPG: 23.1
Average Lifetime MPG: 17.5 (5.7 gallons per 100 miles)
EPA MPG Rating: 19 Combined (16 City/23 Highway)
Best Range: 469.2 miles
Current Odometer: 20,417

Dan Edmunds, Director of Vehicle Testing @ 20,417 miles


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