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Old 08-29-2011, 11:45 AM   #126
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Wish we got the diesel engines here.
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Old 08-29-2011, 10:47 PM   #127
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Do I get a prize for 31.5 mpg in a 245 turbo?
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how psi stock can support?

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Old 08-29-2011, 11:47 PM   #128
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Not quite 35 mpg...

the 740 gets between 10 and 11 l/100 km (21-24 mpg us) but it's the wife's shopping car.

The 940T is my commuter, 80+ km per day, about 1/2 highway, remainder urban, 50 lb in the trunk.
I am now getting 8.80 l/100 (26.7 mpg us) avg of last 4 tanks. This will drop to about 10.5 l/100 (22 mpg) in the winter.

I've got an MPGuino trip computer to help. I can easily get 7.5 l/100 (31.3 mpg) on steady 105 kmh cruise. I've done 6.7 l/100 or 35 mpg on occasion. It's amazing watching how stop and go kills mileage.

940T (302,000 km) is not stock - head shaved .032, .028 squish, stock valves unshrouded, ported just to clean up the casting, stock turbo with MBC at 10 psi, TLAO chips, ignition mod at +3*, autobox, IPD sways, caster and camber mods, 195x65 tires at 44psi.
Love driving this car.
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Old 08-30-2011, 12:08 AM   #129
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My 764TD gets ZERO mpg. It is very efficient. So efficient it shall be going to the junkyard , and pronto.

It barely mustered 34MPG @ 60mph.
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Old 08-30-2011, 12:49 AM   #130
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I'm the opposite of this right now. The 245 is running super duper rich, I gotta figure out what that problem is, but I suspect the AMM. It just cooked the cat, I cut it out and just welded a pipe in (no emissions here). I've got an LH 2.2 computer and AMM, I might just swap to that soon and see if my problem doesn't go away.

Trying to find a G80 for some 3.73s too so I can drop those highway rpms a little from the 4.10s in there now. I thought about going to 3.54s or 3.31s, but I'm wondering if that will get to the point where I could start hurting gas mileage, especially if I end up living in a hilly area (looking at UC Boulder for grad school), any thoughts?
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Old 08-30-2011, 12:57 AM   #131
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Originally Posted by doperide07 View Post
I'm the opposite of this right now. The 245 is running super duper rich, I gotta figure out what that problem is, but I suspect the AMM. It just cooked the cat, I cut it out and just welded a pipe in (no emissions here). I've got an LH 2.2 computer and AMM, I might just swap to that soon and see if my problem doesn't go away.

Trying to find a G80 for some 3.73s too so I can drop those highway rpms a little from the 4.10s in there now. I thought about going to 3.54s or 3.31s, but I'm wondering if that will get to the point where I could start hurting gas mileage, especially if I end up living in a hilly area (looking at UC Boulder for grad school), any thoughts?
Use your gears.
Put it at 2800 - 3000 rpm to climb and take what the speedo gives you.
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Old 08-30-2011, 01:02 AM   #132
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I'm not positive but I think my '83 245 DL has 3.31 gears. I've been consistently getting 32-33mpg cruising at ~65mph. One of my goals for the car is to improve it so that I get 40mpg @ 60mph. That's my target and I'm going to do it!
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Old 08-30-2011, 01:03 AM   #133
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32-33 is doing great ..
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Old 08-30-2011, 01:10 AM   #134
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32-33 is doing great ..
Yeah I was actually really impressed after the first couple fill-ups. It's bone stock too, so I think with a few aero mods and a couple other changes I can bump it up a little bit more.
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Old 08-30-2011, 01:15 AM   #135
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185-75-14's & Coronas FTW.
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Old 08-30-2011, 11:52 AM   #136
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I get 38mpg in my 760 turbodiesel with a m46 with 3.90 rear end :p
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Old 08-30-2011, 03:03 PM   #137
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32-33 is doing great ..
BMW's midsize 5-Series "expects to get better than 32 mpg." (four-cylinder)

Mercedes C-Class..."31 mpg on the highway." (four-cylinder)
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Old 08-30-2011, 03:09 PM   #138
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My '90 245 M47 trans LH3.1 gets 26/29 city/highway stage zeroed. I assume the lean-runnin' 3.1 injection has a bit to do with that, along with the M47 trans. I feel pretty happy with that though - it is on par with the CAFE standards from last year.

It won't be for long since they are bumping CAFE up to 54.5 mpg by 2025...
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Old 08-30-2011, 10:30 PM   #139
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...bumping CAFE up to 54.5 mpg by 2025...
1960 era - However, the most astounding demonstration was the record set in the Pure Oil Economy Trials, another NASCAR-supervised event: 51.281 miles per US gallon (4.5868 L/100 km; 61.586 mpg-imp), which AMC sagely noted, "No car owner should expect to approach in everyday driving."[12]


PS: If you want to evaluate your mileage, do like they did back then, drive some 2,000 miles.

In the 1960 Mobilgas Economy Run, a Custom two-door sedan returned 28.35 miles per US gallon (8.297 L/100 km; 34.05 mpg-imp) over a route of more than 2,000 miles (3,200 km), finishing first in the compact class. Further proof of the American's exceptional fuel economy came when an overdrive-equipped car driven coast to coast under NASCAR's watchful eyes averaged 38.9 miles per US gallon (6.05 L/100 km; 46.7 mpg-imp).
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Old 08-30-2011, 10:44 PM   #140
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The Mobil Economy Run is used to explain the claims made for United States Patent # 3937202 - an "Economy driving aid"[6]:
"... The experience obtained by skilled drivers in the Mobil Economy run indicates that for best fuel economy, a car should be operated at nearly constant speed in the range of 30 to 50 mph. Rapid accelerations or decelerations and operation at (or near) full throttle should be avoided. To practice for economy runs, skilled drivers used special instrumentation to determine the operating conditions for best fuel economy. This instrumentation usually included a vacuum gauge to indicate intake manifold vacuum, a special odometer to measure distance traveled to hundredths of a mile, and a burette to measure gasoline usage. However, instrumentation of this type is extremely complex for the normal driver and is additionally quite expensive. ..."
"... It is an objective of this invention to provide a signal to the operator of a variable speed, variable power internal combustion engine when the engine is being accelerated or decelerated too fast, in addition to a signal when the engine is being operated at too high or too low a power output. ..."
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Old 09-30-2011, 04:59 AM   #141
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ok; found out that my real life KM are 98.742% of what my car says (so if my car says i drove 1000km i drove 987,42km)

I'm taking pictures of the fuelling pump and how many km's I've driven and it's looking good for that badge :D
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Old 09-30-2011, 05:00 AM   #142
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ok; found out that my real life KM are 98.742% of what my car says (so if my car says i drove 1000km i drove 987,42km)

I'm taking pictures of the fuelling pump and how many km's I've driven and it's looking good for that badge :D
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Old 09-30-2011, 11:42 AM   #143
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My brother got a flat 50mpg in our stock '92 245 with an m47 shifting at 2 grand and never going over 55mph, throwing it in neutral on every decline and hill and coasting when possible.
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Old 09-30-2011, 10:40 PM   #144
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My brother got a flat 50mpg in our stock '92 245 with an m47 shifting at 2 grand and never going over 55mph, throwing it in neutral on every decline and hill and coasting when possible.
I believe the injectors turn off if you coast down declines while still in gear but if your in neutral it goes in idle mode. At least that's what my narrowband AF gauge told me before.
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Old 10-01-2011, 12:28 AM   #145
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I have never managed more than 27 in my 240 in mostly freeway driving during my commute to work. This was in a 86 240 that was almost totally stock in cool weather (no a/c) and I drove it easy. Typically it was about 26 and after the +T it has been 23 mpg week in and week out.
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Old 10-01-2011, 12:39 AM   #146
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28 mpg out of the 1988 745 w/ m47.

31 mpg out of the 1980 242 with the m46 and LH1.0 fitted , 3.91 final drive. good stuff, for sure.
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Old 10-03-2011, 02:52 AM   #147
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Quote:
Originally Posted by BoostIt View Post
My brother got a flat 50mpg in our stock '92 245 with an m47 shifting at 2 grand and never going over 55mph, throwing it in neutral on every decline and hill and coasting when possible.
it's better to put it in a higher gear and let it roll down the hill than idling it
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Old 10-03-2011, 04:17 AM   #148
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did i double post the post above or below?

Last edited by towz-T; 10-03-2011 at 04:26 AM..
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Old 10-03-2011, 04:17 AM   #149
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by the way, it's looking really good for the 35+mgp club (or the <6,75l/100km club)

First i was like




but then i did this




and then i was like




so i drove (913*98.742%) 901.5 KM on 57.99Litres of diesel.

Meaning i do 6.436L /100km.

OR i drove 560.172 miles and needed 15.3193 gallons to fill it up
wich means i did 36.566 mpg.
But i had a lot of HEAVY traffic and calls from the FD (mich means i drive 1.5miles on an avarage of 9 to 7 mpg)

Last edited by towz-T; 10-03-2011 at 04:40 AM..
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Old 10-03-2011, 12:32 PM   #150
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Not in the 35mpg club, but I've got my 940 running really well lately. My last few fill-ups are showing ~27mpg on my commute which is about 90% highway miles. NA's got the taller rear end so at 70mpg I'm at almost 3k rpm. A different rear end might put me at 30mpg on the highway. Still, I think 27mpg out of a slab-sided stock 940 with a ancient engine design isn't bad. 245's seem to be the poop when it comes to mileage though, on highway trips my old 88 used to get around 30mpg without even trying.
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