Cruising Boost

Reply Subscribe

Thread Tools

Search this Thread

Jan 30, 2024 | 03:59 PM

Harveyearlolstad

Thread Starter

More Turbo

Joined: Aug 2019

Posts: 536

Likes: 118

From: Norcal

Cruising Boost

What is everyone's boost number cruising at 70mph flat on the freeway? Just trying to compare to mine. I'm sitting between 7-8 psi. Just curious. I'm not getting the gas mileage I expect.

Jan 31, 2024 | 05:58 AM

tjc transport

i ain't rite

Joined: Mar 2005

Posts: 65,448

Likes: 5,517

From: Marlboro Mental Hospital.

that is about rite.
these trucks were not made to cruise at 70 MPH. at that speed i would expect 14 mpg or so.
drop it down to 60 and you should see about 2 mpg better.

Jan 31, 2024 | 08:22 AM

knottyrope

Lead Driver

Joined: Apr 2016

Posts: 7,180

Likes: 1,336

From: Bahstun

about 6 at 60 mph

19 MPG if I keep off the skinny pedal

Jan 31, 2024 | 10:05 AM

Hit Man X

Lead Driver

Joined: Sep 2002

Posts: 9,497

Likes: 2,020

From: North Texas

I dork along about 65mph on the open roads. Boost I see about 4-5psi, but I also have a slight manifold leak now.

City in the ECLB five speed dually I do about 9-11mpg. I think I saw 16mpg once going 60mph on the freeway cruise.

Jan 31, 2024 | 11:58 AM

Harveyearlolstad

Thread Starter

More Turbo

Joined: Aug 2019

Posts: 536

Likes: 118

From: Norcal

I'm seeing 10mpg in most or some cases. That's just from reading from the gauge. I did ran a 40 mile trip where it looked like I was getting 15mpg. I have a cclb and pulling no weight. It's pretty surprising that mpg varies so much between trucks. Good to hear that my boost number are normal. It's safe to say that I have boost leaks

Feb 1, 2024 | 10:23 PM

fordman67

Hotshot

Joined: Dec 2005

Posts: 14,375

Likes: 604

From: evansville in

I might get 4-5 cruising. Mpg? Never heard of her..I only drive mine to tow with so it's usually single digits.

Feb 2, 2024 | 08:13 AM

z31freakify

Hotshot

Joined: Dec 2012

Posts: 11,267

Likes: 1,649

From: Las Cruces New Mexico

Depends what gear, tire size and rpm you are turning at 70MPH. With my the factory turbo running 3.55 285-75-16 tires at 65MPH I was at 1600, 1700 rpm i was about 0-2 psi and got a whopping 17.5 mpg on flat ground with no wind on my factory setup with 160/0 injectors

My average mph highway is about 70-80 rpm around 2000-2300rpm 7-9 psi, and mpg on average is 15 mph (rebuild engine, rebuild trans, 160/0 injectors, tune, super duty turbo with billet wheel etc)