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  #1  
Old April 1st, 2011, 01:18 PM
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Baird M. Gehring
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mpg

just calculated my mileage yesterday and found out I get around 8.5 mpg on my 1997 D90 ST. Only has about 70,000 mi on it and a new 4.6 block and a/c so thats a negative. Was wondering if this is about normal for Defenders or if I can get a little better mileage? 10 mpg at least would be nice.
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  #2  
Old April 1st, 2011, 01:25 PM
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Brian
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I get like 10 in mine and probably 9-11/city in both my Discos which have 4.6s.
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  #3  
Old April 1st, 2011, 01:29 PM
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Brad Harris
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holy crap!!

buy stock in opec and just have some fun I guess
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  #4  
Old April 1st, 2011, 01:33 PM
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Paul
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~22 around town and 27 on the highway in my 4bd1T powered 110. It's not quick off the line though.
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  #5  
Old April 1st, 2011, 01:34 PM
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Jeff Huff
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I routinely see 14-15mpg in my '94 with a 3.9L
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  #6  
Old April 1st, 2011, 01:35 PM
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Any check engine lights?

How are your O2 sensors? Are they original?

It would probably be worth replacing the front two O2 sensors with new as you should be getting at least 11-12.

Ron
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  #7  
Old April 1st, 2011, 01:53 PM
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Bill Adams
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17 in the Loob with a tail wind.
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  #8  
Old April 1st, 2011, 01:53 PM
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Chris Snyder
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These threads always get me wondering. I've gotten 18mpg in my '94 with street tires. I've checked it and rechecked it via GPS and everything I can think of. It was real.

I can pull 16mpg with LTB's.

You guys must have heavy feet.

(and no april fool )
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  #9  
Old April 1st, 2011, 01:54 PM
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kevin
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This thread makes me feel a little better about my MPG in the 130. After fueling up yesterday I averaged 11mpg, not bad.
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  #10  
Old April 1st, 2011, 02:12 PM
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I get 12-13 doing 90mph.
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  #11  
Old April 1st, 2011, 03:05 PM
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Matt
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I was averaging 11-12 in my 110 with a very tired 3.9.
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  #12  
Old April 1st, 2011, 03:13 PM
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Jeff Huff
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I assumed it was understood but often forget that folks outside of NOVA haven't seen me drive...my 14-15 is highway speeds well above the posted limits! If I drive "nice" that can go up to 16mpg pretty easy
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  #13  
Old April 1st, 2011, 03:34 PM
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Matthew Greenspan
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Are you guys calculating your MPG based of odo reading or actual distance travelled? Tire size differences?
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  #14  
Old April 1st, 2011, 03:34 PM
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Baird M. Gehring
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I thought about replacing my oxygen sensors whichare original but the dealer told me they only replace them when they go bad in which case I would have a code. Plus doing all the sensors looks like at least a $400 job and I don't know if it's really worth it to replace them all unless I get about 5 miles to the gallon better than I do now. If replacing the front two will get me 11-12 mpg then I guess that's okay so maybe I'll look into that. No check engine lights. Original wheels and bfg all terrain tires.
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  #15  
Old April 1st, 2011, 03:40 PM
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Two things:

1. When O2s throw a code they have to be REALLY BAD. What happens is over time they get slow and MPG suffers.
2. Only replace the front two as the rear two only "check" the front two and don't effect the mixture. Save the front two for it you get a code for one of the rear two. Two OEM new ones from roverguy are $200-250 last I checked.

No promises, but it sounds like something is not right unless you are running on like 36in swampers or something and the O2s are the most likely fault. Do you see lots of black soot in the tailpipe or when accelerating? Does it smell like gas from the tailpipe? Do the plugs look like they are running rich (black sooty build up)?
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  #16  
Old April 1st, 2011, 04:57 PM
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Gren Thomas
1985 90 300tdi auto
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8.5 MPG holy S*!t on my 3.5ltr running 235x85x16 i got 17MPG around town & 21mpg on a run at 60ish
I now get 24-26mpg on a 300tdi with zfhp22 over the same journey.

It may be worth seeing if you can get the ECU tweeked after the sensors have been proved.

regards all

Gren
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  #17  
Old April 1st, 2011, 05:11 PM
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Bradlee Duncan
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Quote:
Originally Posted by jefhuf View Post
I routinely see 14-15mpg in my '94 with a 3.9L
That's about what I see too.
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  #18  
Old April 1st, 2011, 06:23 PM
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Phillip
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8-13 on my classic, I hold it to the floor everywhere I go it wont die. before I fucked with the top end I used to average 15ish. I am around 10-15 in my 90 with 255's. I used to easily get 17 when my Defender was stock.
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  #19  
Old April 1st, 2011, 09:03 PM
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Weird. I regularly get 14-15 in my 93 110 with a new 4.6.
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  #20  
Old April 1st, 2011, 10:41 PM
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