My mpg prior to the PS/MMO was running about 21.75. however the truck is probably still loosening up as I only have 15.5K miles. The trip that I get 22.5 on is a 275 mile round trip over the cascade mountians that I make very often. I start at 600ft elevation go over a couple of 4500 ft passes, probably total elevation gain/loss for the round trip is about 10000ft. I drive with a light foot but usually can't resist at least 1 full throttle pass up a 6% grade.

regards,

jim b

 

Thanks for the update. I see you did the tone ring advance mod, I am planning to do that myself. Are your quoted mpg both after the advance?

I drive like you, easy most of the time, but I love the way this thing can accelerate going up a grade.

 

Do not many people here use stanadyne? I was going to switch to stanadyne because i heard a lot of good things about it. I may just keep using power service and maybe the MMO mix... just wondering what you all thought about stanadyne

 

I'd try Stanadyne at least once if I could find it, but Wal-Mart has Power Service products so I use the silver bottle, and have been since new.

 

I personally don't trust the effectiveness of the factory water separator, which is why I'd never run stanadyne, which has a demulsifier. Powerservice and many others solubize/emulsify the water that's present in all fuel to safely pass through the system. I have tried almost all available diesel additives and so far like Redline the best.

 

I have been using PS Diesel Kleen/MMO in my truck since day one and ran it in my 01 for 4 years. I switched to Stanadyne/MMO for a little over a month because I was given 4 bottles of it. My truck lost 1.5 mpg on the Stanadyne while I was using it. I went back to the PS after the Stanadyne was gone and my mileage has gone back up to where it was before. I don't know why but my truck for some reason likes the PS/MMO better. I will stick with it from now on.

 

One would think that emulsifiers for water in fuel would be the preferred practice in marine diesels, for obvious reasons, but water seperators seem to be much more common. Since we have no control over how much water ends up in the fuel, even in our trucks, it seems to make more sense to remove it rather than trying to emulsify some unknown amount. A two stage system is perhaps best, a first stage consisting of a separator and then a second stage consisting of an emulsifier, but since that doesn't seem to exist for our trucks I'll stick with a demulsifying additive that complements the water separator.

http://www.cat.com/cda/components/se...0&languageId=7

Caterpillar Inc.
Cat® Marine Power
Diesel fuel feature story
187-P-2-004-98


Water in your fuel can cause injector seizures and failures at sea. It also accelerates wear of expensive fuel system components. Add salt spray and wear increases rapidly.
Water separators are critical to fuel treatment and should be used on all marine diesel installations. Operators of large vessels often install centrifuges which continuously recycle the fuel to remove water and sediment.

 

When I'm towing, I run 8 oz of PS white with a complete fillup. With Dave Kelley's tank vent kit, my "34" gallon tank actually holds over 38. With the 8 oz, I get about 1 to 1.5 mpg better mileage. If not towing, makes no difference.

 

I did not use a fuel additive for at least a year and a half after I bought my 03, just straight #2 diesel. Started using Power Service Diesel Kleen (gray bottle) in August 04.

At my work place (govt job) we started using the ULSD (Ultra Low Sulfer Diesel) in Sept 04. About two to three months of using the ULSD our shop started seeing a rash of our early model (late 90's early 2000) Ford diesel pick-ups developing fuel leaks at the lift pumps. The shop had to replace the pumps, non-fixable. The mechanics I talked to at our shop was blaming these leaks on the ULSD, to dry of fuel in their opinion. According to our fuel manager he was told by fuel supplier this could happen on the older fleet. The later model trucks were not affected by the fuel or in our case none was reported to be, no leaking pumps, no replacements.To my knowledge no injector pumps were replaced either, even ones having lift pumps replaced.

They started using a fuel additive in our storge tanks and soon afterwards the common rash of fuel leaks went away. I recently talked to one of our shop mechanics a few days ago and ask him if any more problems have developed with leakings pumps or replacing them, his answer was "no" ever since we started using the additive that problem has not come up.

My understanding is this ULSD is to go nationwide summer 2006. The color of the fuel we use is "clear" looks just like water to me. So to me the lubrication part is the most important to me even though the later models are suppose to be compatible with the ULSD I plan on using a fuel additive just for a little insurance myself. I have been wanting to try the PS MMO mixture, but have not yet.

Some places through out the U.S. may be using the ULSD, but they also may be using some sort of lubricate added either by fuel supplier or at the station, speculation on that last statement I don't know for sure.

Tony

 

Stanadyne is what I use, it is a very good additive. Make sure the additives you use are alcohol free or they will eventually dry out the rubber seals in your fuel system. During the wintertime here the school corporations and county employees all use stanadyne formula in the diesel trucks and school buses.