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bobcat_ron
01-07-2011, 01:20 PM
I need to update my GPS system for my truck, I need the ACTUAL fuel economy numbers for highway/city for a 2005 F450 Powerstroke, 325 hp and 570 ft/lbs torque 5 speed auto and middle range rear end gearing (what I mean by that is I had 3 options fo rear end gears, low was so low the RPM's on highway would be well over 2500+, high was so high I would blow my tranny, middle was perfect)

I don't want your numbers, I need the actual numbers as they would have appeared on the sticker on the side window.

I have searched for an hour and all I got was bullsh*t and reviews.

I need numbers.

Thank you.

Marek
01-07-2011, 01:24 PM
You might not find mpg on any window stickers . In the US they are not required to put them on HD trucks. Which rear does the truck have ?

bobcat_ron
01-07-2011, 01:35 PM
You might not find mpg on any window stickers . In the US they are not required to put them on HD trucks. Which rear does the truck have ?

4.10 or something, I wish Gravel Rat would chime in, he's got almost the same truck as I do.
The next option was 5.15 (or 5.25??) and 3.73.

Gravel Rat
01-07-2011, 01:41 PM
Your out of luck Ron, Ford never posted fuel mileage numbers for F-450-550 trucks I don't think the gov't requires it.

The F-450/550 trucks only come with two gear ratios 4:30 and 4:88, my F-450 has 4:88 gears open diff, it was spec'ed for towing a trailer.

You can find out what gear ratio your truck has their should be a white tag on the center chunk on the rear diff.

bobcat_ron
01-07-2011, 01:52 PM
Your out of luck Ron, Ford never posted fuel mileage numbers for F-450-550 trucks I don't think the gov't requires it.

The F-450/550 trucks only come with two gear ratios 4:30 and 4:88, my F-450 has 4:88 gears open diff, it was spec'ed for towing a trailer.

You can find out what gear ratio your truck has their should be a white tag on the center chunk on the rear diff.

I went looking for that sticker last time I did my inspection and it's MIA.

Could I assume my fuel economy "might" be almost the same as a DuraMax?

Gravel Rat
01-07-2011, 02:31 PM
I think you can safely say 12 mpg is the best a F-450 is going to do. You would have to drive like a little old lady to try get anymore than 12 mpg.

360ci
01-08-2011, 04:43 PM
I need to update my GPS system for my truck, I need the ACTUAL fuel economy numbers for highway/city for a 2005 F450 Powerstroke, 325 hp and 570 ft/lbs torque 5 speed auto and middle range rear end gearing (what I mean by that is I had 3 options fo rear end gears, low was so low the RPM's on highway would be well over 2500+, high was so high I would blow my tranny, middle was perfect)

I don't want your numbers, I need the actual numbers as they would have appeared on the sticker on the side window.

I have searched for an hour and all I got was bullsh*t and reviews.

I need numbers.

Thank you.

There should be a sticker of sorts in/around the glovebox (if equipped) that states axle ratio. As you have the 450, I'll assume at a minimum either 4.10 or 4.30 gears are installed.

As for economy I can't see you doing much better than 15mpg highway (65mph) empty. 100% city driving I'd put it around 10-12mpg depending on the amount of lights, turns, etc. At least the 5 speed manual is more efficient overall than the automatic. Run synthetic fluid in the differential as it might lower friction enough to warrant a slight mileage improvement.

Only compare the duramax with similar tire size, axle ratio and GVWR. Comparing your 450 to a 3500 GM DMax isn't the way to do it.

bobcat_ron
01-08-2011, 06:03 PM
There should be a sticker of sorts in/around the glovebox (if equipped) that states axle ratio. As you have the 450, I'll assume at a minimum either 4.10 or 4.30 gears are installed.

As for economy I can't see you doing much better than 15mpg highway (65mph) empty. 100% city driving I'd put it around 10-12mpg depending on the amount of lights, turns, etc. At least the 5 speed manual is more efficient overall than the automatic. Run synthetic fluid in the differential as it might lower friction enough to warrant a slight mileage improvement.

Only compare the duramax with similar tire size, axle ratio and GVWR. Comparing your 450 to a 3500 GM DMax isn't the way to do it.

12/15 sounds more like it. Thanks.

dwc
01-09-2011, 12:37 AM
Copy and paste this address but put your vin # after the =.
http://fordlabels.webview.biz/webviewhybrid/WindowSticker.aspx?vin=

Like this:
http://fordlabels.webview.biz/webviewhybrid/WindowSticker.aspx?vin=1FTFW1R60BFA20366

I know it won't have fuel mileage numbers but you can see the build specs anyway.

WorldsStrongestLandscaper
01-09-2011, 08:09 AM
Well I like to DRIVE my 05 F-550 Crew 12' Rack 6.0 like its supposed to! I get 4-5 miles per gallon in town 51 Gallons= 200-225 miles!I have the lower gear ratio. I built the truck myself. WTF do u do to get more than 10????!!!!BIG STEVE B CT STRENGTH WSL
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360ci
01-09-2011, 08:30 AM
F550 weighs more than a F450. Depends also on cab config, bed options and length, etc. 4-5mpg seems low. You can get a class 8 that gets better mileage. Something doesn't sound right. My old F450 V10 with 11' service body and 4.30 gearing got 9mpg on a bad day. Thus, the smaller diesel should easily get 10+.

Running a low geared truck on the highway is the wrong way to do it. You have to compromise otherwise an aftermarket two speed axle would be the way to go for maximum economy. If your engine runs over 2500rpm at 65-70mph highway, you're over-geared and just wasting fuel. Loaded, you should be in the 2000-2300rpm range so there's enough flexibility for you to downshift to maintain momentum (speed) on the highway.

Gravel Rat
01-09-2011, 01:11 PM
Well I like to DRIVE my 05 F-550 Crew 12' Rack 6.0 like its supposed to! I get 4-5 miles per gallon in town 51 Gallons= 200-225 miles!I have the lower gear ratio. I built the truck myself. WTF do u do to get more than 10????!!!!BIG STEVE B CT STRENGTH WSL
Posted via Mobile Device

My truck weighs 9800lbs empty it is a 2006 F-450 2wd I get 12 mpg empty and 10 mpg with a load on the truck. I also live in a area with 10% grades the truck is never on flat land.