View Full Version : fuel economy. F450 vs 3/4 v.s one tonne

01-19-2010, 08:09 PM
I'm looking at buying a used truck in time for the spring and have been looking around alot lately. I was looking for one in the 2500/250 & 3500/350 size range, and I found an F450 dump at a really good price and low km's (25000) with it being a 2004 model. What type for fuel economy difference will the F450 diesel have over a 250/2500 and a 350/3500. I don't really need the extra capacity but it is alot cheaper than anything else I was looking at and would be nice.

01-19-2010, 10:27 PM
Fuel economy probably wouldn't be much different. A better question to ask is why the truck is so cheap; maybe the 6.0 diesel that it has is a lemon. Get a carfax report before you buy.

01-19-2010, 10:47 PM
Yeah I would skip on the 6.0. If the miles are that low, and it's as cheap as you say, it's probably got un-curable problems. If your really interested you can check on an Oasis report on the truck, that should give you a little information if it's got any issues.

As far as fuel mileage, the mileage on the 3/4 or 1-ton will be noticeable better than the 450. The 450's are built with much heavier parts, and typically have lower gear ratio's for extreme towing and hauling power. If you don't need the capacity than I would go with a 3/4 or 1-ton.

Gravel Rat
01-19-2010, 10:51 PM
A F-450 is only going to get 12 mpg at best don't really expect much more. A 1 ton dump maybe 14 at the most and your dealing with a truck that can't carry any weight.

01-19-2010, 11:07 PM
Well cheap maybe wasn't the right word to use, its $25 000 and most other 3/4 to one ton's are about 4-5 thousand more with about 35-50 more km. Plus its in great shape, near perfect interior and exterior

01-19-2010, 11:11 PM
Gravel Rat are those mpg in Canadian or imperial gallons, plus are they from your experience with yours?

Gravel Rat
01-19-2010, 11:27 PM
It is US gallons which is what they us to judge fuel mileage in the USA.

My F-450s I have had and currently have never reall broke the 12mpg mark. Out in Ontario where you have the indy 500 freeways I'am not sure if you will get the best of fuel mileage. Where I live 80km/h is top speed limit so I'am usually doing 90km/h or 100 at the most at short distances.

A 2004 with only 25,000 kms sounds like its been a problem child. I thought my 03 had low kilometers when I bought it at 58,000 kms.

I would definatly get a Oasis report on the 2004 if it come off with a long list run like h*ll.

I know one of the building supply stores had a 04 450 it was a real problem truck got rid of it at a loss. The person that bought it sold it at a loss to get rid of it.

01-21-2010, 07:52 PM
The F450 will have 4.56 gears or taller, with tall tires should equate to no more than 2000rpm at 60mph, but that still doesn't leave much room for play (1000rpm more til redline). Most F350's especially the newer models with the 5 speed trans and 4.10 gears will turn several hundred rpm less which will net better mileage on the highway. Low torque allows for low rpm at lower speed without excessive downshifting. The F450 WILL burn more fuel than a lighter spec'd truck. Heavier frame, larger tires, taller ride height all decrease performance. You have to decide if you need the payload and can put up with the harsh ride for a few thousand less than a one ton.

Gravel Rat
01-21-2010, 08:33 PM
My current F-450 has 4:30 gears I can do 100km/h at 2500 rpm in 5th gear (6 spd) put it in 6th your down to 2000 rpm or a little less.

You had to order a F-450 with 4:88s if your looking at a 03 and newer 6.0 the F-550s come standard with 4:88s.

01-22-2010, 04:48 PM
Mpg will also depend on the body. Less mpg with a cab shield or stake body as the will catch and drag more air. Gravel you have a flat bed right ?

01-22-2010, 06:27 PM
The one I'm thinking about has a dump bed. How much would an average dump bed weight?

4 seasons lawn&land
01-22-2010, 08:44 PM
Its cheap because its a 6.0. Dont do it.

If your using it for lighter duty or personal use at all then you wont like it anyway. That is a dump truck chassis. Its made to haul an 8k payload.

I know you really only asked about MPG but just trying to help you out. As far as the mileage its not even in the equation for the powerstrokes unless its the old 7.3 that ended in 03 I think. Get ANY other diesel for decent economy.

01-27-2010, 02:17 PM
I do have a second car that I own,but I'm starting to think there is a reason it is almost perfect, even though it is a little over kill for me. A 1 ton dodge would be perfect for me but all the ones I look at are 4wd, 100 000km and 5-7 grand off new.