MPG Has Dropped - 2019 V8 eTorque

[Miamiair]

Greetings all, I have a 2019 Bighorn with the 5.7 eTorque. There are 97,500 miles on it. There is no misfiring, replaced the air filter(K&N Cold air), and the tank empties a lot faster these days. It has taken place over the last month. I used to use 60 as a benchmark, and would get anywhere between 24-29 mpg. Now I get 21-24 mpg. I notice on warmer days I get better MPG than on cold days. A full gas tank would get me about 392 miles of range. Now its like 370, and this is no scientific measurement.

Any ideas what could be the cause?

 

[Bigskyroadglide]

First thing I'd suggest is winter gas. 2nd thing given your mileage is dirty throttle body, 3rd is its about time for plugs at 100k, last intake air leak due to loose intake bolts. If you try to tightening remember it's 108 inch lbs or 9 ft lbs for a torque spec.

That's all I got

 

[Wild one]

Everything Bigsky stated plus it takes more power,and therefore more gas to turn driveline components when they're cold.You'll always get better milege on a warm day compared to a cold day,as wheel bearings / diff gears etc. are all easier to turn

 

[Docwagon1776]

I don't know if you go to a winter blend of gas in Miami, but it will cause lower fuel economy. Also, you'll always get worse economy in colder weather because colder air is denser. Denser air equates to more wind resistance. Think of how a vacuum has zero wind resistance and it makes sense.

Also, K&N lets more dust/dirt in. You *may* get more airflow, but at a cost.

 

[RamDiver]

And, your avatar indicates Miami as home.

The present-day cold temperatures are a bit cooler than in recent years and Clearwater, only a bit over 100 miles away, received snow that stayed on the ground.

Maybe, you should provide a relative temperature range and details on the fuel used.

Cooler temps bring fewer mpg, just ask anyone living in Canada.

My EVIC often displays 21/22 mpg on rural highways. Last night with the temperature close to freezing and a strong gusty headwind, I saw 12/13, no more than 14 mpg. Wait till a colder day like this morning, it will get worse up here.

Also, winter fuel and/or a higher ethanol will all impact mpg.

.

 

[Bigskyroadglide]

@Docwagon1776 I thought we got winter gas every where as it's the refineries changing the formula not the location of the dispenser pump? I could be 100% off base but when I lived in Houston it's was summer gas and winter gas regardless of temp or weather. I never thought somewhere like Miami might be different. Now I gotta investigate, good catch on location.

 

[Zoe Saldana]

Seriously dude ... think about it. Winter/cold = more time/gas to get up to operating temps.

 

[Docwagon1776]

@Docwagon1776 I thought we got winter gas every where as it's the refineries changing the formula not the location of the dispenser pump? I could be 100% off base but when I lived in Houston it's was summer gas and winter gas regardless of temp or weather. I never thought somewhere like Miami might be different. Now I gotta investigate, good catch on location.

Could be, like I said I don't know. I know certain regions and cities get a different summer gas than others do, so figured maybe winter gas could potentially be different as well but I'm not saying they do.

 

[Burla]

Could be, like I said I don't know. I know certain regions and cities get a different summer gas than others do, so figured maybe winter gas could potentially be different as well but I'm not saying they do.

explained here.

"Winter gas" is really "normal" gas and summer gas is actually the legislation target, do to "EVAP", but whatever summer gas has more energy. If I was getting 21-24 mpg which is the op's complaint, I'd be happy as a pig in stink. My engine is running like a top and I'm getting 10mpg just verified today again. I am due for a tune up, we'll see if that gains me anything new plugs and cleaning tb and stuff.

 

[Burla]

@Docwagon1776 I thought we got winter gas every where as it's the refineries changing the formula not the location of the dispenser pump? I could be 100% off base but when I lived in Houston it's was summer gas and winter gas regardless of temp or weather. I never thought somewhere like Miami might be different. Now I gotta investigate, good catch on location.

read that link I posted, kinda explains it without explaining it, lol..

 

[zrock]

what was said above and get run of that K&N worst filter you can put on a passenger veh.

 

[Wild one]

read that link I posted, kinda explains it without explaining it, lol..

This had me laughing,lol. Never had an engine not turn over because it had summer fuel in the tank at -30. I also fill up all my Jerry cans before the switch to winter fuel,and have never had any issues running summer blend when it's cold.Typical C&D article some truth and a whole lot of BS thrown in with it

"Using low-RVP fuel is a nonstarter in freezing weather; the engine won’t turn over or might misfire."

 

[etbrown4]

Ive had 2) 5.7 hemis, over 150 000 miles and I think there's a better explanation of 24-29 mpg and what happened.

Chances are the 24-29 mpg never existed in the first place, therefore 20 or 21 was correct all along. Even 24 is not in the cards unless you are going down hill at 45 mph.

 

[David James]

Greetings all, I have a 2019 Bighorn with the 5.7 eTorque. There are 97,500 miles on it. There is no misfiring, replaced the air filter(K&N Cold air), and the tank empties a lot faster these days. It has taken place over the last month. I used to use 60 as a benchmark, and would get anywhere between 24-29 mpg. Now I get 21-24 mpg. I notice on warmer days I get better MPG than on cold days. A full gas tank would get me about 392 miles of range. Now its like 370, and this is no scientific measurement.

Any ideas what could be the cause?

Normal. Always get lower mpg in cold weather.

 

[Nbonco]

I have the same motor and if I got close to the mileage you say you’re getting I’d be happy. I have the 32 gallon tank and never got better than 18 mpg. If you’re getting the type of mileage you’re talking about you should be over 600 miles a tank, you saying 390 per tank that would be like 13 miles a gallon. Recheck your miles on paper not the gauges.

 

[nlambert182]

29mpg? On paper?

I'm tossing the flag on that one. You may be in the 16-19mpg range mixed driving but there's no way that truck ever saw 29 unless the entire trip was downhill in a tailwind with the engine off. 392 mile range at 29mpg would mean you have a 13.5 gallon fuel tank. That's half the size of a standard 26 gallon fuel tank. Are you sure there isn't a typo somewhere? At 24 mpg you should have had over 600 miles of range on a tank.

 

[Dusty]

Seriously dude ... think about it. Winter/cold = more time/gas to get up to operating temps.

Also, modern fuel delivery systems sense the temperature of air and sometimes fuel and this is used by the PCM to decrease air-fuel ratio. With more dense air, more fuel is used.

Regards,
Dusty
2019 Ram 1500 Billet Silver Laramie Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33-gallon fuel tank, 18” wheels. Build Date: 3 June 2018. Now at 126040 miles.