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Old 05-29-2006, 07:04 PM   #1 (permalink)
edh
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Default What works to improve 4litre v8 gas milage?

Has anyone got a tried and true method to improve gas mileage on my 96 Disco?
My previous veh ran on Propane and I'm going to look into converting again but I've been told there could be problems switching this particular engine over.
I'd like to try to max out the gas mileage. My vehicle gets tuned regularly..sp plugs, air filters, oil filters all changed at least annually. My driving is at least 50% hwy. Exhaust checked recently in good shape. All liquids up to the mark and checked reg. I try to keep the tank topped above 3/4. I usually burn regular gas but about every third top up is premium.

Any suggestions????

Ed
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Old 05-29-2006, 07:20 PM   #2 (permalink)
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Default mpg

I have a 97 and until recently was getting about 15 average; 17 hwy. It is the 4.0 L V8i. Recently I've had some issues and it has dropped, but the following seems to help.

Change your oil really regularly and transmission fluid when you do. Any additional friction hurts mpg.

Same with differentials..change regularly.

Make sure the tire pressure is correct. It matters.

For me, I can get a couple more miles per gallon by the solution at the bottom of this post..........
.
.
.
.
.
.let my wife drive.
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Old 05-29-2006, 07:34 PM   #3 (permalink)
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Ed,
I loose nearly 2 MPG on regular. Most who have tried and checked will tell you the same thing.
You might want to read up on some of the acetone mixture that some people on this site have tried.
I have read that 8 ozs. of acetone with 22 gals of supreme will give you 3 plus MPG.
Mike
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Old 05-29-2006, 07:55 PM   #4 (permalink)
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Use premium fuel and drive gently.
Lots of the propane conversions or diesel conversions take years and years to pay for themselves. I had a propane powered Silverado work truck and it was a problematic pile of crap- not to mention having that huge bomb right behind me (the tank). I hated it... it was such a dog when running on propane that I rarely did it- the engine eventually grenaded and I was given a different vehicle to use (police package Impala- back when they had V8's).
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Old 05-30-2006, 05:21 PM   #5 (permalink)
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Easiest way to get MPG = keep your foot out of the radiator

If I take it easy on the highway (65 MPH or less) and don't drag race everyone at the stoplight grand prix I can pickup 2-3 MPG.

Another "improvment" is leave the roof rack off when you're not using it. My D2 would get about 40-50 miles per tank less when I had the rack on.
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Old 05-30-2006, 05:45 PM   #6 (permalink)
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Premium, or at least mid grade fuel has a noticeable effect on fuel economy. I always run at least 89 with every third fillup being 93 and I saw 20 mpg during a long highway cruise with the cruise control set at 68. That is with a safety devices roof rack and a sea kayak on the roof. When I got to hills, I simply pulled into the slow lane and let all the other wannabe suv's scream on by while I laughed all the way to the gas pump. Unlike most SUV drivers, a rover drivers pride won't be hurt by slowing down and letting faster traffic go past. The single best way to get good economy in a land rover is to be ever-aware of where your foot is on the accelerator. If you have to shed a couple of mph, and can do so safely, don't be tempted to floor it up hills to maintain speed. Chances are you will most likely make up the few seconds lost from slowing up a hill on the way back down. All the suggestions given by other members is also equally as important in keeping your MPG high.
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Old 05-30-2006, 06:57 PM   #7 (permalink)
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Install a vacuum gauge. Besides being an excellent way to diagnose engine problems, a vacuum gauge will teach you how to really save gas through the judicious use of the throttle.
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Old 05-30-2006, 07:46 PM   #8 (permalink)
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Keep a cup of coffee in the cup holder without a top on it. It'll teach you to drive gently.
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Old 05-30-2006, 08:16 PM   #9 (permalink)
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Quote:
Originally Posted by Muddy Oval
Keep a cup of coffee in the cup holder without a top on it. It'll teach you to drive gently.
better yet... the drink holders under the cubby box lid.
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Old 05-31-2006, 12:46 AM   #10 (permalink)
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Thumbs up Khaos Supercharge

hi all,

i have a disco 98 D1 series 3.9, v8i. i am based in Riyadh, Saudi Arabia. Although the price of gasoline here is now reduced from SR. 0.90 to SR 0.60, i am still saving a lot milleage when i have installed Khaos supercharger philippine made product. Before my 80 ltrs would only give me 365 kms after installing this device it gives me 450 kms.

cheers,
royemaun
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Old 06-10-2006, 01:13 PM   #11 (permalink)
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Quote:
Originally Posted by royemaun
hi all,

i have a disco 98 D1 series 3.9, v8i. i am based in Riyadh, Saudi Arabia. Although the price of gasoline here is now reduced from SR. 0.90 to SR 0.60, i am still saving a lot milleage when i have installed Khaos supercharger philippine made product. Before my 80 ltrs would only give me 365 kms after installing this device it gives me 450 kms.

cheers,
royemaun
Is this just a supercharger kit for the Disco? where did you purchase it at?
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Old 06-10-2006, 03:20 PM   #12 (permalink)
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the Khaos thing is a long-running hoax... it's an air-bleed device that sounds impressive, but actually is nothing but snake oil. people that buy it often think it works because they don't want to admit they fell for it.
kinda like those bilge pumps being sold on ebay as electric superchargers.
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Old 06-10-2006, 04:24 PM   #13 (permalink)
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Question But the million dollar queston is.........

Quote:
Originally Posted by Disco Mike
Ed,
I loose nearly 2 MPG on regular. Most who have tried and checked will tell you the same thing.
You might want to read up on some of the acetone mixture that some people on this site have tried.
I have read that 8 ozs. of acetone with 22 gals of supreme will give you 3 plus MPG.
Mike
Interesting but....

The million dollar question is if anyone hear has done acetone and is still doing acetone to their LR. Do you , Mike? Is so, how long and how did you come to the 8ozs to 22 gals of supreme (that is 93, not 94, I take it?).

Adam in NYC
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Old 06-10-2006, 05:17 PM   #14 (permalink)
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I'm getting 15 city and 17 highway I do drive gentle and use nothing but premium gas with a fuel injection cleaner every 3000 miles and keeping my trans fluid fresh. I now have a 2half inch OME lift and 265/75/16 tires.
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Old 06-10-2006, 08:05 PM   #15 (permalink)
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ease up on the EFI cleaner- it's been known to corrode the fuel sytem, that's why Land Rover says not to use it in the manual. Rover has a specific one that is not caustic that should be used, but not as frequently.

Acetone works... I've tested it quite thoroughly and although I can't say it won't have long term issues, it does improve MPG.
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