A Thought About MPG - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 12 (permalink) Old 05-17-2010, 07:57 PM Thread Starter
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A Thought About MPG

In addition to my F-350, I also own a 1996 Impala SS.

Driven exactly the same (no fun flooring it) the Impala struggles to get to 21 MPG.

The car weighs slightly more than half what the (unloaded) F-350 weighs.

The car has a smaller frontal area and I suspect a lower coefficient of drag.

Both vehicles' tires are aired up rock hard and both are well-aligned.

But the F-350 gets 6-7 MPG better.

Does that speak volumes about the efficiency of the diesel and the manual transmission or what?

2000 F-350 SC 4x2 6 speed
3.08 gears Gear Vendor Overdrive
Slammed 4"
Rugged Air Dam
315,000 miles
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post #2 of 12 (permalink) Old 05-17-2010, 08:30 PM
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Re: A Thought About MPG

Diesel engines alone are ~30% more efficient. I've always believed in the ability for a manual trans to offer up better economy, but with today's technology, I'd think that most of that would be subjective to the driver's habits. Especially with the modern aftermarket TCs and tuning available.

IMO, modern gas engines suffer more because of all the extra emissions control junk that leach power away in order to compensate for inefficently burnt fuel. It would be great if they were more efficent, but then they would be diesels, right?
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post #3 of 12 (permalink) Old 05-17-2010, 09:09 PM
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Re: A Thought About MPG

I would blame a combination of emmissions equipment and poor factory tuning. Try a catback and see if you don't pick up a few by cutting some of your pumping losses.
Edit: is it the supercharged version? If so, I don't know how you're getting that good of mileage...

Dan
96 Powerstroke: 6637, downpipe to dump exhaust, 140v IDM and a shift kit.

84 Honda Sabre V65 1100: pipes, jet kit and new tires. Faster than I think I'll ever need.
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post #4 of 12 (permalink) Old 05-18-2010, 12:21 AM Thread Starter
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Re: A Thought About MPG

The Impala has a Borla catback.

No supercharger, just factory MPI.

2000 F-350 SC 4x2 6 speed
3.08 gears Gear Vendor Overdrive
Slammed 4"
Rugged Air Dam
315,000 miles
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post #5 of 12 (permalink) Old 05-18-2010, 01:43 AM
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Re: A Thought About MPG

So your saying you get 26-27 mpg.... ok im too lazy to search... school me a little if you mind
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post #6 of 12 (permalink) Old 05-18-2010, 03:03 AM
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Re: A Thought About MPG

look at his signature. he gets 27 mpg in the summer in his truck

Dan
96 Powerstroke: 6637, downpipe to dump exhaust, 140v IDM and a shift kit.

84 Honda Sabre V65 1100: pipes, jet kit and new tires. Faster than I think I'll ever need.
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post #7 of 12 (permalink) Old 05-18-2010, 03:04 AM Thread Starter
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Re: A Thought About MPG

Check out the sig, dude.

2000 F-350 SC 4x2 6 speed
3.08 gears Gear Vendor Overdrive
Slammed 4"
Rugged Air Dam
315,000 miles
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post #8 of 12 (permalink) Old 05-18-2010, 03:07 AM
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Re: A Thought About MPG

Nice car! Pics?
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post #9 of 12 (permalink) Old 05-18-2010, 11:47 AM
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Re: A Thought About MPG

Much of that advatage over gassers looked to be going away from what I have seen with the new direct injection systems. Higher power and greatly improved mpg. So it was down to the actual higher energy content of diesel fuel. Not to mention DPF is a mpg killer they do not have to deal with going forward. But then you take a look at what these new 6.7 Fords are getting and it looks like it turns it right back on its head. With over 28 mpg when driving with mpg as the goal with a 390 hp 745 tq 8000+ lbs vehicle. That with DPF. Impressive IMO.
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post #10 of 12 (permalink) Old 05-18-2010, 12:35 PM
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Re: A Thought About MPG

Dave, kind of off topic, but, you mentioned sintered metalic pads swelling, what was your fix? different pads? shave-clean old pads?? also I assume you are lubing caliper slides on a regular basis? thanks.

1997 f250 4x4 sclb, auto, 3.55's, 191k, diy intake w 6637, ccv mod, pyro, boost, trans gauges, 3" dp to 4" single exh. super chips for now. scangauge
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Besides there is absolutely no way to idiot proof something, since they are always coming out with better idiots by the day
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