What MPG are we experiencing?

[Banger]

I picked up my RHO late last week, and have just about 200 miles on it. I thought I'd report my MPG so far, and also give a reference for comparison of my outgoing vehicle.
My daily commute is 23 miles each way, the majority of it is highway. The speed limit is 70, and I set the cruise control on 80. Yes, I realize that this will dramatically reduce my fuel efficiency compared to what the manufacture says, but that's why I listed it because individual driving habits will greatly influence this number. I'm sure the average MPG will change as I get much more data into the truck, but thought it would be cool for others to see and share.

Right now my avg MPG is 11.9. I'm not disappointed in that at all, considering the loss of fuel economy at 80PMH (sometimes more).

For reference, my outgoing vehicle was a 2020 Rebel with the 5.7L Semi V8. This time of year, I averaged high 14's to mid 15's for MPG (higher in the warm weather). The window sticker listed 15 city/21 highway/17 avg for MPG.

My individual driving habits put me about 2MPG below the average of 17 for the Rebel.

For the RHO, my driving so far puts me about 3MPG below average.

Comparing my driving on the between the two trucks, this represents about a 3-3.5 MPG reduction going from the Rebel to the RHO, which is about what I expected. I'll update once I get more miles and data on the truck.

Let me know if you guys have any questions or want any more info.

 

[Steadi]

Is this hand calculated or the trucks computer? If hand calculated, how different does is computer in the truck, if at all?

 

[Banger]

Is this hand calculated or the trucks computer? If hand calculated, how different does is computer in the truck, if at all?

Both calculations are from the trucks’ computers.

 

[RHOfan]

In 650 miles, computer says lifetime average of 14.1 mpg. Hoping I can get to the 15 mpg the epa says. Other than some freeway full throttle blasts, I’ve driven it like a grandpa.

 

[NDanecker]

IMO I wouldn't look at mileage until you hit 1000+ miles but definitely not before 500. I have a theory that they run a different tune up until 500 miles which coincidently when launch unlocks. I caught a video with a truck under 500 miles that did a full throttle acceleration that only hit about 14psi which is half of the advertised 28psi. With that said I wouldn't take the mileage you see on the drive home as what you'll be seeing after a few thousand miles.

 

[RHOfan]

IMO I wouldn't look at mileage until you hit 1000+ miles but definitely not before 500. I have a theory that they run a different tune up until 500 miles which coincidently when launch unlocks. I caught a video with a truck under 500 miles that did a full throttle acceleration that only hit about 14psi which is half of the advertised 28psi. With that said I wouldn't take the mileage you see on the drive home as what you'll be seeing after a few thousand miles.

I’ve experienced what you are saying. BUT, pretty sure mine unlocked around 300 miles for full boost.

 

[Eighty]

You need probably 1000 miles to get anything remotely accurate from the computer. The truck spent its first few weeks of life doing nothing but idling at the factory and in transit. So that will average into the computer’s calcs until it doesn’t anymore.
But don’t trust the computer anyways. My TRX lies and says I get 12.xx, whereas the real calc is normally in the 10’s.

 

[CajunRHO]

IMO I wouldn't look at mileage until you hit 1000+ miles but definitely not before 500. I have a theory that they run a different tune up until 500 miles which coincidently when launch unlocks. I caught a video with a truck under 500 miles that did a full throttle acceleration that only hit about 14psi which is half of the advertised 28psi. With that said I wouldn't take the mileage you see on the drive home as what you'll be seeing after a few thousand miles.

I easily hit 28 psi before 200 miles, so that's definitely not true.

 

[Eighty]

I easily hit 28 psi before 200 miles, so that's definitely not true.

That’s a little low for tire pressure - 35-38 would be better. But this thread is about mpg, not psi.

 

[RHOfan]

I easily hit 28 psi before 200 miles, so that's definitely not true.

Huh. I wasn’t expecting boost to be limited in the 1st few miles, but I really think it was.

I saw 14 psi with 95% throttle on the highway, at 180+ miles. Figured it was an anomaly. A week or so later, 300+ miles total, the same throttle input got me into the 20s. Since then, I’ve seen the full 28 psi with full throttle.

I’m not really worried about it. It had enough power at 14 psi. 28 psi doesn’t really “feel” all that different. Just drinks more fuel. This isn’t a rocket ship. It has enough power to be safe & enjoyable.

 

[NDanecker]

Huh. I wasn’t expecting boost to be limited in the 1st few miles, but I really think it was.

I saw 14 psi with 95% throttle on the highway, at 180+ miles. Figured it was an anomaly. A week or so later, 300+ miles total, the same throttle input got me into the 20s. Since then, I’ve seen the full 28 psi with full throttle.

I’m not really worried about it. It had enough power at 14 psi. 28 psi doesn’t really “feel” all that different. Just drinks more fuel. This isn’t a rocket ship. It has enough power to be safe & enjoyable.

I am wondering if the various max boost scenarios is torque management.

 

[RHOfan]

I am wondering if the various max boost scenarios is torque management.

Doubt it. All my heavy throttle inputs have been at 60 mph or greater (per owner’s manual recommendation).

 

[DaddyKaddy]

Not sure I have ever achieved EPA estimates in a vehicle. I swear they give them vehicles that can actual breathe to test with