Fuel Economy Update for March - More Refined But Still Plenty Fun

2015 Ford Mustang GT Long-Term Road Test

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2015 Ford Mustang GT: Fuel Economy Update for March

April 3, 2015

2015 Ford Mustang GT

The very first fill-up of March was a lost cause. I'm not entirely sure what happened, but our 2015 Ford Mustang GT fuel logbook contains the simple note "pump issues" where the gallons-added entry should be.

I suppose we'll never know the fuel economy of those 227 miles.

And I think I should also exclude another 90.9-mile fill-up, even though no mistake was involved. It was a full fill, too. I personally added 15.363 gallons of premium with just three miles to go on the distance-to-empty meter.

How could this be?

I was at a track-day fundraiser at Willow Springs raceway that you'll read about in a future post. Near the end of the day, the car stumbled while cornering hard in Turn 5, whereupon I returned to the pits and drove straight out the gate to the nearest gas station. The in-car gauge read 6.3 mpg, but the math worked out to just 5.9 mpg.

Not a very representative activity, I must admit.

With the track day included, the stats work out like this.

Worst Fill MPG: 5.9
Best Fill MPG: 22.8
Average Lifetime MPG: 14.6 (6.8 gallons per 100 miles)
EPA MPG Rating: 19 Combined (15 City / 25 Highway)
Best Range: 263.9 miles
Current Odometer: 4,722 miles

Here's how it changes when I omit the track day.

Worst Fill MPG: 9.5
Average Lifetime MPG: 15.1 (6.6 gallons per 100 miles)

Either way, our lifetime average rounds to 15 mpg, which is no better than the EPA city rating.

Some might say this is all down to journalist driving. That's not as much of a thing as you might think, but the allure of a Mustang 5.0 GT V8 with a 6-speed manual is hard for some people to resist. It sounds and feels fantastic when you toss a few revs and trundle around a gear lower than you should for maximum mpg. I bet you'd do it, too.

Also, the Mustang hasn't been on many long-distance road trips yet. I expect it can and will do better. Time will tell.

Dan Edmunds, Director of Vehicle Testing @ 4,722 miles

2015 Ford Mustang

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