Fuel milage has suddenly dropped

[LVBase]

My 2022 2.3 10 Speed 2 door Bronco's milage has suddenly dropped. After driving almost 3000 miles with my Bronco getting 19/20 around town and 21/22 highway it has suddenly dropped on the last 3 fillups. It struggles to get 16 around town and 18 highway. My estimated range per tank went from around 320 to 280. I put Ranger Sport wheels and tires on but the size difference is negligible. Maybe it's the AC because of summer but that seems excessive.
Any thoughts?

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[BroncoSarge]

My 2.7 sits between 16.9 and 17.2.

 

[Go Devils]

2.7 2door. 21.6 average. You might want to double check with same fuel, same station hand calculated. I’m digging the MPGs on mine.

 

[Bronco Don]

My 2.7 black diamond is getting up too 23 Highway if I keep it at 65 MPH on flat highway

 

[LVBase]

It is same fuel and same station. Hand calc shows the drop also.
It happened after a trip to Utah from Vegas. I saw lower milage during the trip but it was mountain driving 80 mph speed limits with the roof rack loaded and a brutal headwind on the way home. Next fill up gave 280 mile range (I'm assuming it averaged the previous tank) and the wish O meter never seemed to return to previous milage. I used to jump on the freeway and the milage would just climb right up. Now it takes the whole tank to struggle to 18 mpg with highway driving. Right now this tank all city is barely getting to 15.

 

[smonroe11]

Summer gas. Ethanol %?

 

[1970AMCAMX]

My 2022 2.3 10 Speed 2 door Bronco's milage has suddenly dropped. After driving almost 3000 miles with my Bronco getting 19/20 around town and 21/22 highway it has suddenly dropped on the last 3 fillups. It struggles to get 16 around town and 18 highway. My estimated range per tank went from around 320 to 280. I put Ranger Sport wheels and tires on but the size difference is negligible. Maybe it's the AC because of summer but that seems excessive.
Any thoughts?

Probably a combination of things. If the mileage went down when it heated up it makes sense, your motor is going to be more efficient when it is cooler out, you are running a/c, and you changed the tires (are they wider, taller, heavier, different brand with more rolling resistance?)

 

[Deleted member 3063]

April 2022
"On Tuesday a plan to suspend a ban on summertime sales of higher-ethanol gasoline blends, a move that government officials said was aimed at reducing gas prices but that energy experts predicted would have only a marginal impact at the pump."

the real goal was to increase overall gas supplies that would have a bigger affect on prices.
in my opinion the reduction on mileage would wipe out any gains.

 

[LVBase]

Maybe so, I think they are using ethonol this summer to offset the gas prices. I was happy with the original milage, now ugh.... Not much better than my 98 F150 now.

 

[BSheppard]

Sometimes depending on how slanted the gas station parking lot is my Bronco can hold another few gallons of fuel.

Really matters on a fill up where you are calculating by how much you just pumped.

Also, strangely the air con really matters more on the Broncos mileage than other cars I own.

I also have a 911 that cares not if the air runs or not. Same mileage all the time. Air on or off.

 

[LVBase]

A little followup on my poor milage. After 3 fill up's with lousy gas milage I filled up a couple days ago with the wish 'O' meter at 17.1 mpg and hand calc 15.4 I was pretty bummed. I always reset my trip meter every tank. As soon as I left the station I knew it was different, the mpg rapidly went up and within a few miles it was at 20 mpg like it had been the first 5 months. It's now between 20 and 21 mpg around town. Haven't tried the highway yet. I have no idea what is different.

 

[P52Ranch]

Is it possible you were filling up with E15 (15% ethanol) for those tanks and are back to E10 or possibly E0 (straight gasoline). Ethanol in the blend will have an impact on fuel economy. E10 will get about 5% lower economy than E0. E15 would be even worse.

 

[Brockdog12]

My average around town. Had to take my 10000 mile pic.

 

[LVBase]

Anything is possible, I was leaning towards the AC but 4 to 5 mpg for AC seems extreme, also was considering the fuel but I don't know. I recognized it immediately leaving the gas station when the milage crashed watching the lie 'O' meter and again when I just fueled up this time. I mean it couldn't have burned up the fuel in the line already it showed up so fast. I'm just happy it's back.

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