Poor Gas Mileage?
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Drifting
Joined: Sep 2021
Posts: 26
Likes: 4
From: New Jersey
I took an Autel scanner. The long term trims where 4 and 3 in idle. When I accelerate the long term trim went up to 10 and 9. Typically when the go up, it could be something with the MAF .
I plan on graphing out the MAF g/s against different RPM ranges to see if there any issues.
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Drifting
Joined: Sep 2021
Posts: 26
Likes: 4
From: New Jersey
Some ideas beyond the ones that have been mentioned:
- stuck caliper (piston)
- stuck brake shoe
Both of these usually present themselves as a slightly burning smell, warm/hot wheel, warm/hot caliper, jumpy driving at 60-90 km/hm etc. very noticeable contribution to bad fuel economy - 20 l/100 km easily achievable……..
Depending on where you are located and the age of the vehicle the caliper rubber seals will eventually go, water will enter, the piston will start to rust, etc.
FWIW, I’ve replaced 3/4 calipers within the last four years. The shoes and caliper piston can also be stuck on the same wheel at the same time 🙈😂
My D3 V8 uses ~ 16 l/100 km over a distance of 80000 km. So in US terms 14.7 miles per US gallon. I use an iOS app, road trip, to store my expenses and fueling data.
- stuck caliper (piston)
- stuck brake shoe
Both of these usually present themselves as a slightly burning smell, warm/hot wheel, warm/hot caliper, jumpy driving at 60-90 km/hm etc. very noticeable contribution to bad fuel economy - 20 l/100 km easily achievable……..
Depending on where you are located and the age of the vehicle the caliper rubber seals will eventually go, water will enter, the piston will start to rust, etc.
FWIW, I’ve replaced 3/4 calipers within the last four years. The shoes and caliper piston can also be stuck on the same wheel at the same time 🙈😂
My D3 V8 uses ~ 16 l/100 km over a distance of 80000 km. So in US terms 14.7 miles per US gallon. I use an iOS app, road trip, to store my expenses and fueling data.
Also, give the truck is in AWD all the time (which I did not know), would explain why I hear a faint noise from the differential.
Thread Starter
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Drifting
Joined: Sep 2021
Posts: 26
Likes: 4
From: New Jersey
Update: I have changed to top tier gas. I also found a station that does not have ethanol and they use a detergent with PEA. I pay about 20 cents a gallon more for premium. My gas mileage numbers have normalized between 13.6 to 16.2 mpg. I watched a one hour video on gasoline from the Porsche Club of America which I highly recommend you watch on YouTube. I would definitely recommend putting top tier gas in your Land Rover.
Rock Crawling
Joined: Mar 2021
Posts: 256
Likes: 76
From: Seattle
Running low octane fuel will lower mpg. Going from 92 to 87 octane will drop fuel economy about 10%. This is one of the most common reasons for poor mileage on the 4.4L engine.
Fuel economy also dips a bit in the winter due to different fuel blends and also engine performance during prolonged warm-up or cold idle start-ups.
On long trips in the summer, I can get up to 22 mpg highway. Winter city driving is around 14mpg.
Top Tier gasolines include additives that will clean your fuel injectors, among other things. It’s not that different from running the occasional bottle of BG-44 (or whatever) through the engine. Personally, I only fill up at Costco. It’s cheaper than the discount places and has all the snake oil that the Top Tier brands include.
Fuel economy also dips a bit in the winter due to different fuel blends and also engine performance during prolonged warm-up or cold idle start-ups.
On long trips in the summer, I can get up to 22 mpg highway. Winter city driving is around 14mpg.
Top Tier gasolines include additives that will clean your fuel injectors, among other things. It’s not that different from running the occasional bottle of BG-44 (or whatever) through the engine. Personally, I only fill up at Costco. It’s cheaper than the discount places and has all the snake oil that the Top Tier brands include.
Mudding
Joined: Sep 2020
Posts: 113
Likes: 28
Thread Starter
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Drifting
Joined: Sep 2021
Posts: 26
Likes: 4
From: New Jersey
Are you speaking specifically about the 4.4, or are you making a general statement? For the 4.4 that was designed to run on 91 I can see this being an issue, but generally speaking, so long as you're running the needed octane, going to a higher octane will not improve MPG. For the best performance of a motor, you should actually run the minimum octane needed for the engine to perform as it should and not pull timing to compensate.
I have been reading about ethanol:
Being highly hygroscopic, ethanol will enable whatever fuel it's blended with to absorb more water. Water in fuel is rarely a good thing, and causes a number of problems for the equipment that uses that fuel.
With respect to the octane, if I recall because my brother and I have the XJ8 with the 4.2L. It asks for 98 octane.
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Drifting
Joined: Sep 2021
Posts: 26
Likes: 4
From: New Jersey
Yes it is the 4.4L.
I have been reading about ethanol:
Being highly hygroscopic, ethanol will enable whatever fuel it's blended with to absorb more water. Water in fuel is rarely a good thing, and causes a number of problems for the equipment that uses that fuel.
With respect to the octane, if I recall because my brother and I have the XJ8 with the 4.2L. It asks for 98 octane.
I have been reading about ethanol:
Being highly hygroscopic, ethanol will enable whatever fuel it's blended with to absorb more water. Water in fuel is rarely a good thing, and causes a number of problems for the equipment that uses that fuel.
With respect to the octane, if I recall because my brother and I have the XJ8 with the 4.2L. It asks for 98 octane.
Rock Crawling
Joined: Mar 2021
Posts: 256
Likes: 76
From: Seattle
Are you speaking specifically about the 4.4, or are you making a general statement? For the 4.4 that was designed to run on 91 I can see this being an issue, but generally speaking, so long as you're running the needed octane, going to a higher octane will not improve MPG. For the best performance of a motor, you should actually run the minimum octane needed for the engine to perform as it should and not pull timing to compensate.
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