Better 7.3 Powerstroke MPG and HP … at the Same Time

Yes, you can get better 7.3 MPG and Horsepower.

Here's how:

7.3 Powerstroke MPG and HP (Horsepower) Image

7.3 Powerstroke MPG - The Diesel Difference

Compared to a standard gasoline engine, a Ford F250 equipped with a 7.3 diesel engine is generally more fuel-efficient—i.e. you'll get better 7.3 Powerstroke MPG than say an F250 equipped with a gasoline V10.

Since diesel fuel stores about up to 15% more energy than gasoline, your 7.3 Powerstroke diesel will, properly driven, get around 30% better MPG than that F250 V10.

But, since most places I looked, including and Nada guides state that "EPA Fuel Economy MPG estimates not available" for the 7.3 Powerstroke, I had to do some digging to find averages that I'd consider reliable.

7.3 Powerstroke MPG Estimates

Since most of the 7.3 MPG information out there is second-hand heresy off of forum posts anyway, I used number averages from a site called Using their tools I got a lump sum average from tens if not hundreds of actual 7.3 diesel owners, stating their own experience with miles per gallon fuel efficiency.

Here's what I found:

1999 Ford F250 7.3 Diesel MPG states that "Based on data from 92 vehicles, 5,396 fuel-ups and 1,822,710 miles of driving, the 1999 Ford F-250 Super Duty gets a combined Avg MPG of 14.82..."

2000 Ford F250 7.3 Diesel MPG states that "Based on data from 92 vehicles, 3,981 fuel-ups and 1,223,722 miles of driving, the 2000 Ford F-250 Super Duty gets a combined Avg MPG of 14.07..."

2001 F250 7.3 MPG states that "Based on data from 66 vehicles, 3,750 fuel-ups and 1,010,890 miles of driving, the 2001 Ford F-250 Super Duty gets a combined Avg MPG of 13.62..."

2002 Ford F250 7.3 Diesel MPG states that "Based on data from 68 vehicles, 5,084 fuel-ups and 1,838,593 miles of driving, the 2002 Ford F-250 Super Duty gets a combined Avg MPG of 13.38..."

2003 Ford F250 7.3 Diesel MPG states that "Based on data from 17 vehicles, 1,362 fuel-ups and 395,452 miles of driving, the 2003 Ford F-350 Super Duty gets a combined Avg MPG of 12.79..." and for the 250 "Based on data from 31 vehicles, 1,140 fuel-ups and 332,545 miles of driving, the 2003 Ford F-250 Super Duty gets a combined Avg MPG of 12.59..."

7.3 Excursion MPG

And finally, I looked up all model years of 7.3 Excursion and averaged their diesel MPG. Out of 119 Ford Excursions that provided 2.9 million miles of real world fuel economy Ford Excursion 7.3 diesel MPG reportedly averaged about 13.8 MPG.

Ford 7.3 MPG Vs. 6.8L V10 MPG

97 Ford F-250 Super Duties provided with 1.2 million miles of real world fuel economy & MPG data. Over the entire span of their production range, 1999-2010, And Ford V10 gas engines produced a reported average MPG of between 8.1 and 11.7 MPG. 

Which holds true with our data of 7.3 Diesel MPG, at roughly 13-14 MPG, averaging around 25-30% better than a similarly powered gas engine.

A few things about these 7.3 MPG stats:

First, all theoretical statistics on MPG are complete BS—only your own field data is reliable for you. Because the way you drive, the quality of the diesel fuel you put in your vehicle, and how well you maintain your engine are what will truly determine your own results.

That being said, a few things to keep in mind:

  • These statistics are suspect—not enough participants, hand-calculated MPG, and stated numbers vs independent study numbers
  • However, the MPG does fall very close to what I'd "expect", and what I actually found in anecdotal 7.3 MPG information while surfing forums for a few hours, as well as my own hand-calculated 2002 Ford F250 Crew Cab 7.3 Powerstroke diesel MPG.
  • The vehicle numbers are based on blending all model and body styles—single cab, super cab, crew cab, and dually alike
  • You'd expect super cab, crew cab, and dually to get less 7.3 MPG simply by weight alone than a single cab 7.3 diesel.
  • Also, did you notice that as the model year gets newer, the average 7.3 MPG actually GOES DOWN! Hmmm... If I were a conspiracy guy, I'd say that increasing EPA emissions requirements might, oh I don't know, cause manufacturers to engineer emissions solutions that reduce engine efficiency and overall MPG as they struggle to comply. Can you say 6.0L Ford diesel fiasco? I digress...

7.3 Powerstroke MPG Range

After surfing more 7.3 MPG data and stories than is healthy, the personally reported fuel efficiency numbers for most 7.3 Powerstroke diesels seem to fall somewhere in the 13 City/ 18 Highway range.

Calculating Your 7.3 MPG

If you surf the Internet for 7.3 Powerstroke MPG, you're going to come across forum posts that reference "hand-calculated" miles per gallon.

Simply put, and at the risk of being too comprehensive, here's what hand-calculated MPG means and how it's done:

  1. Fill up your tank until the gas pump fill handle clicks—automatically shuts off. Don't top it off.
  2. Take note of your odometer reading and/or reset your trip meter.
  3. Drive normally for at least a few hundred miles, because the smaller the amount of miles the less accurate your calculation will be.
  4. Back at the gas pump for a refill, write down your ending mileage.
  5. Fill the tank back up, letting the pump handle automatically shut off again—I try to go to the same gas station and pump so that I remove variations between different pumps. Anal? Yes. More accurate? That's what I tell myself.
  6. Subtract your starting mileage from your ending mileage or simply use the mileage from the trip meter reading, provided you reset it earlier.
  7. Now divide that number by the number of gallons required to fill your tank back up and voila

I know that was too basic, but someone was going to ask me, so ... there it is.

7.3 Powerstroke MPG and the $13 Loaf of Bread

A 7.3 guy goes into the grocery store, and...

(Already heard this story? Scroll to the bottom of the page to read how you can get more mpg and horsepower from your 7.3 diesel)

Way back in 2007-2008, the average US price for diesel fuel skyrocketed. To make matters worse, my wife and I were living in San Jose, CA at the time.

Now, it's a gross understatement to say that California politicians love their gas taxes. A fact that makes a California diesel fill up one of the most expensive in the nation. Doesn't matter if gas prices are up or down, sunny beaches, movie stars, and "free" stuff for everyone apparently costs money.

And since they can't make the electric car drivers pay for it, that leaves you and I and our nasty diesel trucks to foot the bill. Ah, a rant for another day...

Back to 2007-2008 diesel fuel prices...

Bay Area diesel pump prices were constantly "topping-off" at over the $5 per gallon mark. And my 2002 Ford F350's 7.3 diesel mpg being what it was... At best my F350's fuel economy was 15-16 mpg highway and somewhere below 12 mpg in Silicon Valley's "pause and putter" traffic.

Let's just say that driving my truck for anything beyond absolute necessity was painful on the pocketbook.

So when my wife casually asked if I'd run to the store and get bread for our kids' lunch sandwiches the next day, I froze up. Then I quickly did some tricky math in my head, At 10 miles per gallon, for almost 20 miles round trip, that's...

Now, I'm no "Ford genius engineer", but by my calculations that single loaf of bread was going to cost $13 by the time I got it back to the house.

What happened, you ask?

Well, I mumbled something to my wife about "this not being Russia and bread shouldn't cost … blah blah." Then I diligently went and got the bread, of course. Not the point.

But since I was certainly not selling my diesel to buy a Tesla — it won't tow a trailer — something had to be done. That's when my interest in increasing my 7.3 Powerstroke's mpg started.

7.3 Powerstroke MPG and HP: Two Sides to the Same Coin

Mandating increases in fuel economy is an American government obsession. And the very death of your 7.3 Powerstroke diesel engine's production run is a direct casualty of that obsession.

These days, you're dealing with tougher than ever emission standards. If you were prone to conspiracies, you'd think that "they" don't want you driving anything but an electric thimble up and down the roads. Nah, that can't be, right?

But believing that you can get more horsepower from your 7.3 Powerstroke while at the same time increasing its mpg? That's just lunatic talk right there … isn't it?

However, better mpg at the sacrifice of horsepower doesn't have to be your only choice.

I've discovered some interesting things about diesel fuel and the correlation between miles per gallon—fuel economy—and 7.3 diesel fuel efficiency.

In the articles below, you'll discover 7.3 upgrades you can install to increase your 7.3 Powerstroke's horsepower without sacrificing fuel efficiency.

Read these articles and never buy $13 loaves of bread again: