LR3 on regular gas - Defender Source
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  #1  
Old September 22nd, 2015, 10:21 AM
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After running premium in my cars for years, I decided to give regular a try. The last three fill ups used regular. Besides saving ~ $65/month with the switch to regular on the LR3 alone, the MPG appears to be the same as if running on premium. Driving it on regular feels the same. What have I been missing all of these years besides the additional cost? The D90 will stay on premium (timing set at 7 or 8* btdc).
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  #2  
Old September 22nd, 2015, 12:21 PM
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Russ, fwiw, I've used regular in the three NAS 90's I've owned. Probably a combined 200k miles with no problems. I've had to clean components but have not had to replace anything yet. My current 90 has over 110k of my miles. I probably average 14mpg primarily up and down route 7. I've had the same plugs and wires for at least 90k miles and my idle is calm and steady 750.
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Old September 22nd, 2015, 01:21 PM
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Quote:
Originally Posted by down_shift View Post
After running premium in my cars for years, I decided to give regular a try. The last three fill ups used regular. Besides saving ~ $65/month with the switch to regular on the LR3 alone, the MPG appears to be the same as if running on premium. Driving it on regular feels the same. What have I been missing all of these years besides the additional cost? The D90 will stay on premium (timing set at 7 or 8* btdc).
You are doing it backwards

Run the 90 on regular that old " Buick" can handle it ( as Clay suggested)

Big mistake on the performance of theD3, but you soon will find out when you f-up your PITA injection system
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Old September 22nd, 2015, 01:23 PM
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How is it a big mistake exactly?
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Old September 22nd, 2015, 01:36 PM
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I have never run premium in the D90; I live at 7,000 ft. I was told it does not make a difference at that altitude.......
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Old September 22nd, 2015, 02:02 PM
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Reportedly the LR3/LR4's fuel injectors will get fouled running at lower octane, as will the spark plugs. You can certainly do it if need be but extended use isn't recommended from all I've read.
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Old September 22nd, 2015, 03:08 PM
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Quote:
Originally Posted by BlackField View Post
How is it a big mistake exactly?

Ray beat me to it

and ones that starts it will trigger your CEL every morning when you start it, and the cure is a lot more expensive than the pennies saved on fuel.

I never get it , why buy a gas guzzler if conscious about the fuel price , is like asking someone with an LP640 ..what is the MPG
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Old September 22nd, 2015, 04:38 PM
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The problem you are going to have is lean fault codes on both banks that is caused by dirty injectors. A set of injectors is around $3k, so not worth the savings IMO.

------ Follow up post added September 22nd, 2015 04:40 PM ------

I would go a step further and say only to get fuel from reputable gas stations such as Shell and BP. The first (and only) time my mom got fuel in her '06 RR at Costco, the check engine light came on within a week for lean codes on both banks.
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  #9  
Old September 22nd, 2015, 04:47 PM
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Do Shell and BP sell ethanol aka corn-gas?

I will go a step further and say that octane may not make as much a difference as ETHANOL!

Don't put that ethanol crap in your trucks.

Go to an ethanol-free station.


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  #10  
Old September 22nd, 2015, 04:52 PM
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Given that equivalent MON+RON doesn't affect soot, how does running regular fuel ruin a fuel injector? For every LR3, there are about 10,000 cars running cheap denso injectors on regular fuel, and will do so for literally hundreds of thousands of miles.

Are these special injectors that cost extra so that they can engineer in extra weakness?
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