went to FALKEN WILDPEAK A/T4W LT255 /80 R17 from Hankook 255 /80 R17 and MPG went from 19,5 to 16

[veloci1`]

i replaced my Hankook DYNAPRO XT with FALKEN WILDPEAK A/T4W LT255 /80 R17 because the Hankook were terrible in the rain. the hankook were borderline dangerous.

the Falken are about 12 lbs heavier each than the Hankook, but my mpg went down by 2+ miles. i just do not see how 48 lbs extra can cause this,
i thought it was the last gas tank of gas, blaming a potential issue with the gas, but, i refilled today and the mpg are still around 16 from 19.

i was getting 19 around town and about 20+ on the fwy, i have a 2,7 4wd.

has anyone experienced anything like this? EGR, MAYBE?

let me know

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[FORDTEXAS]

try fully resetting your fuel economy reader or hand calculate your fuel milage because sometimes the truck is wrong.

 

[Je1279]

The heavier rotating mass will definitely have an impact. I average ~17mpg combined (calculated) with a 2" level and 34" AT3W's on aftermarket 20" wheels.

 

[Goldeneye36]

The heavier rotating mass will definitely have an impact. I average ~17mpg combined (calculated) with a 2" level and 34" AT3W's on aftermarket 20" wheels.

Yup. A lot of people don't realize how much adding unsprung and rotating mass negatively affects pretty much every performance and handling aspec of a vehicle.

 

[Theoutdoorsman]

I changed to 10 ply tires from stock in the same size and lost an average of 2 mpg.

 

[WoodBarn Mark]

I went from the stock tires to falken rubitreks. The tires that were on my truck were so bad that I would have to go into 4x4 so as to move in my driveway when it rains. I live in phoenix.... not much rain. Anyway, replaced them at about 12g miles. I now have put 20g on the rubitreks and average 22 mpg. I don't know the weight difference. They have been good, not squishy, good in rain, good for pulling the travel trailer (about 3,000 miles the last year or so), and not loud. And the owner of the tire shop said it makes my truck look like a truck. Ha.

 

[Aonarch]

Unsprung weight typically has a multiplier of at least 4.

So 48x4=192

Tires have different rolling resistances as well, not sure if the Hankooks were very low and the Falkens very high.

 

[DNazzy’s2025]

I agree with everyone’s comments. I have a Powerboost, but was also impacted similarly. Installed 10 ply, 35-11.50 Grapplers. I lost about 3-4 MPGs. I had the Hankook Dynapros on it before. The new tires are like boat anchors. 30 pounds heavier per tire. I’d say 1-2 MPG lost for your new and heavier tires is about right.

 

[jakearb]

It's crazy how much a slight increase in rolling resistance / weight of tires will impact mpg. I previously had a 2.7 and swapped from the stock hankooks to the falken at3ws and immediately saw a 1-2 mpg decrease. My size was 275/60r20.

 

[Suns_PSD]

It's not the weight, it's the RR increase of the AT4s (I run the same btw, great tires). Nothing wrong with the AT4s, just all, All-Terrain tires are worse in this aspect.

When I first replaced my Hankooks (which were like driving on 4 bars of soap in the rain) I choose a Nitto AT tire in the OEM size and with a light ply rating and the tires were just a few pounds heavier. The truck lost 2 mpg.

Later on, I added a 2.5" lift and a MUCH heavier and taller AT tire, and I only lost another .5 mpg after speedo correction.

It's the RR increase; the weight has a smaller effect on mpg.

I will say that those big heavy tires felt like I lost a solid 90 rwhp under full throttle acceleration, that sucks.

 

[Henfield]

Everyone is spot on about heavier tires or wheel and tire combos hurting mpg.
But who buys a F150 for mpg?

 

[DNazzy’s2025]

Well… I think a lot of us do honestly. Otherwise I’d probably drive a Super Duty 6.7 liter! Also definitely depends on how many miles your commute is and whether your pocketbook can handle it or not. I do agree, if you’re expecting to get MPGs like a Prius, then go buy a Prius. On the flip side, a lot of us can’t help our urges to modify these trucks, and then are disappointed to realize how many MPGs we really lost. I’m still fairly happy, I’m pulling about 19.5 MPG with my Powerboost. The 2.5” level and 35” tires are the most aggressive I’ll ever go. It’s still very drivable and maintains most of the practicality.

 

[Suns_PSD]

Yah, I want it all. The very capable truck and as much economy as I can possibly score.

Mine modified averages 18 mpg which isn't terrible but I've been in a rental Corolla for the last week as my truck received some hail damage, and it's pretty amazing to hammer on this little car, driving notably faster than I would my truck, yet average 44 mpg on cheaper regular fuel and it gets an honest 50 mpg if I drive normally. Cars have come a long way, and I guess trucks have technically increased economy 75% too.

Can't believe I'm saying this, but I feel like this truck is going to last me well into old age. Hoping to move it in to back up service in the next couple of years and operate a little EV for daily driving duties.

 

[veloci1`]

thank you all for the feedback. i had a 2020 Ford Ranger FX4, i went up in tire size and even with 2.3 turbo little engine, i only lost .5 MPG. i know we do not buy the F150 for efficiency, but, after my experience with the Ranger, i thought there was something else wrong with the 2024 F150.

it is what it is. thank you again

 

[veloci1`]

It's not the weight, it's the RR increase of the AT4s (I run the same btw, great tires). Nothing wrong with the AT4s, just all, All-Terrain tires are worse in this aspect.

When I first replaced my Hankooks (which were like driving on 4 bars of soap in the rain) I choose a Nitto AT tire in the OEM size and with a light ply rating and the tires were just a few pounds heavier. The truck lost 2 mpg.

Later on, I added a 2.5" lift and a MUCH heavier and taller AT tire, and I only lost another .5 mpg after speedo correction.

It's the RR increase; the weight has a smaller effect on mpg.

I will say that those big heavy tires felt like I lost a solid 90 rwhp under full throttle acceleration, that sucks.

i agree with you 100% on the Hankooks, so slippery on wet roads.

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