My Turbo II LeBaron GTC with a 2.2 and 5 speed gets me 30 mpg or better on average.

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'15 Chrysler 200S V6
'74 Duster 360, factory 4 speed car

Two forums you should check out:

http://www.gassavers.org/

http://www.ecomodder.com/

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1963 Dodge D100, SL6 and 3-on-the-tree.
1961 Dodge D200 Crew Cab, ex-USGOV, SL6 and NP435.

EFI it's going to be the only way to go if you want optimal gas mileage. Sorry carb guys . However, with the high gears and the overdrive tranny this should be a good project. I read a while back that the Feather Duster and Dart Lite would get 32 mpg. That's pushing up on my Saturn! However, on a small tangent I love that 1.9L Saturn I used to have as its torquey and will get an average 36 or even 48 on our way to Montana!

Keep us posted cause I would like to know what I should be getting as far as mileage if I didn't have the disease of Pedi-Leadious.

I still got 18.9mpg with my turbo set up. That was a 100 mile to the track and back with 3 passes. Also ran a 12.95

A high compression normally aspirated slant tuned well would beat that 18.9 MPG handily.

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Joshua

This particular filter was a "Mighty" brand. I had taken the Dart in to our local Valvoline Lube, and they just changed hands. The new owner went with a cheaper "Mighty Brand" filter. The previous owner had been using Wix, so it was a total surprise to me, and about $2000 later and 6 months worth of emails to this site and privately to Doc, trying to figure out what might be the best way to rebuild the SL6 and what mods to make. I really wasn't expecting the filter collapsing inside and then not having the bypass work. A real double whammy!

It would be nice to have a separate sections on this site just for "Urgent" rebuilds that cover the basics. If you want to "Upgrade" your SL6 should be in another section and then all out "Racing" builds. That way you could go to the appropriate section and get the information. The discussion forums are nice to kick around ideas, but it would really be nice to have the engine builds listed in those three sections Urgent baseline rebuilds, Upgrades and Racing.

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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

Agreed, but it wont make the power of a turbocharged slant and what it gives up in economy wont be much. But that isn't the topic of this thread.

Now, on this topic, a turbo would be a mistake, to be sure. A turbo will never give economy, all it will allow you to do is build a mild motor and make power under boost as opposed to a higher powered NA motor that gives up economy across the board. If all you want is mpg, stay away from boost and go the direction Joshua is pointing.

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'15 Chrysler 200S V6
'74 Duster 360, factory 4 speed car

Thanks for all the info guys...I'm going to use this and see what I can do. I'm sure I'll have more questions in the future days

Does anybody know any information on the tuned exhaust on the feather duster. It seems as I read old articles in the Mopar magazines and owner testimony's this car could easily get over 30 mpg's as long as your foot wasn't in it. I would like to know more about the set-up these cars had.

Matt

Interesting notion on maximizing your mileage. I would suggest you think about the following

1. Think holistically--no single thing you do will gain huge improvements in mileage, but a number of well thought out integrated upgrades will get you improvements.

2. The drag coefficient of the cars body is going to be the tough thing to beat--if you go too crazy your MOPAR will be a Prius. I imagine that the drag can be reduced somewhat, and then you can get no lower.

3. Otto cycle engines (i.e. four strokes) are heat engines and are not particularly efficient--perhaps 20% to a upper bound of 40% or so. You can bet that you are at the 20% range right now--you CAN get more out of it.

4. The most direct thing you can do to improve efficiency (and thus mileage) is increase the compression. This is why diesels get better mileage. Presumably you can get the head milled, keeping in mind that you will want to run on pump gasoline (octane of 89 or so). If you ran E85 (ethanol) you can really crank up compression.

5. Other things you can do--Weber 32/36, EFI, tune with an O2 sensor looking for lean across the range, etc. The A833 O/D with a low numerical rear end (perhaps in the high twos or very low threes).

6. Figure out how to "turn off" all loads on the engine when at speed (i.e. when they are not needed)--alternator, fan, power steering, etc. Usually this means making all of these electrical (except the alternator of course) and thus powering them only when needed. Alternators can be modified to flash the field only when battery voltage is below a setpoint, this means you run on the battery until voltage drops below a tolerable level. I know that guys running the quarter mile remove ALL of their belts to knock big chunks of time off. Now, 13 seconds without water flowing isn't a big deal I suppose, but I don't think you want to do THAT on the street. I imagine that a automobile water pump is NOT efficiently designed at all--presumably something could be done with the vane shape, etc there as well.

7. Look at low rolling resistance tires, etc.

Too bad that Chrysler never made a crossflow head for the Slant--I would think that would be worth a few miles to the gallon.

In general all of the things you might do to improve the performance of the engine will also improve the mileage of it. The problem is that your right foot will notice this and probably negate much of the mileage improvement. Getting better MPG really does mean you need to adopt a relaxed driving style as well as doing the simple things like watching tire pressures, tune ups, etc.

Good luck and keep us informed on how it goes...

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Slanted D150

But HECKSHEMI did!

http://www.slantsix.org/forum/viewtopic ... 20&start=0

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vm

First you must define mpg

'68 Cuda coupe with a 318 getting 29.5 MPG at 65 MPH.

That doesn't mean much top me because you have to get the car to 65 mph. Fill the tank to the first click, write down the odo reading, drive your normal route in your normal way until you need gas, fill up at the same pump, note your miles driven, do the math. Do this a few times. Throw out the highest and lowest reading. Average what's left and that's your mpg, IMHO. That would be 35 mpg with my 2455 pound 1.5 litre, 5 spd. manual 80% highway/20% city driving Honda Fit.

You can't change the laws of physics.

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'63 Valiant V200 Convertible
225 Aluminum Block

puttin' around town he is getting 22 or so.

Go read the thread or I will post a link to it later......gotta get 18mpg on the way to work burning soy diesel..........................

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'72 Duster 198 stock cam, 3:23's Hookers on jack stands for 8 years in the driveway
'79 Maxivan 360 Offy Qjet Comp RV cam/rusting in the driveway.
93 D350 160HP Cummins Auto Dually Clubcab needs a injector pump
2005 Golden Couch Buick

My daily driver is a 72 4dr dart.

She gets about 18-20.
The motor has never been right. It may have a burn valve or something and i dont really take good care of it.

But with gas rolling up to 4.00gal i think its time i start getting this thing strait.

I have a "HP" slantsix i built a few years ago sitting in the garage.

It has a home ported head with the MP oversize valves and 340 springs. Milled 60 IIRC.
Isky cam ( RPM-Range (2500-6000) Valve Lift (.448 .448) Valve Lash hot (.018 .018) ADV Duration (264 264) .050 Duration (228 228) LC 109).
Basic bottom end. 30 over.

The car is a 904 276's.

What would be a better cam for millage?
A stocker or is there some aftermarket cam out there?

The final engine has to run on 87.

I plan on putting a freeflowing exhst 2.25 on the next paycheck.

What is the stock jet in a holley 1920? I could try ordering up some smaller jets and seeing if i could lean it out.

About 14 years ago I had a 79 Aspen with the overdrive 4 speed and an incorrect fit rearend (unknown ratio) that regularly got 29 to 30 MPG but I had to slip the clutch to get started. Didn't matter because I only did it twice a day to get to and from work. Also got 29 MPG with a 65 Valiant 3 speed 170 engine on a 500 mile trip at 45 MPH due to icy roads. Good luck, I think you can do it. Pete

Got the new set of jets to try out on weber 32/36 DFEV and suggestions from Carlos on carbsonly.com and more tinkering. It is looking very promising now but I'm not so sure if I'm harming my 2.2 going wayyy lean even I'm not getting the lean surging reaction or the autometer brand of a/f narrowband 20 LED gauge is lying to me.

I'll report with spark plugs condition when I'm at work.

latest setup on primary: idle jet 60, main jet 130, air corrector jet 160.

Cheers, Wizard