MY findings on performance products, fuel treatment products and fuel savings

[Pit Bull]

Originally posted by HC



I've recorded every gallon for over 106k now, and one of the things I have learned is that if you check EVERY tank, you see a lot of variations no matter how carefully you try to fill to the same point at each fillup. If you look at only the first 1 to 3 tanks after a mod and then draw your conclusions, your conclusions will probably not be accurate.

HC, that's interesting. I've noticed the same thing. I also noticed in the TDR that one article indicated that the cetane levels in diesel fuel varied more in the midwest than in any other part of the country. I wonder if this is what we are seeing on a tank by tank basis?

 

[blampright]

EdgeEZ got me almost 2mpg

The only upgrade I've seen a proven increase in mpg is from my EdgeEZ computer. I keep a mpg log and have tracked my mpg since day 1. My EdgeEZ gave me about 1. 5mpg. I average 16. 5 around town and 19. 5 highway. My highway milage is typically 80mph unloaded. The best I've achieved is 21mpg.

 

[Snow man]

Since ive bombed my truck,i havent been able to keep my foot out of the power for a full tank of fuel,ive tried,and about 1/2 way thru the tank ill get on it,and crank her up. I have a hard time staying under 2500RPM on the highway,and under 25 lbs of boost,its part of the bombing disease,i guess. Since ive added the B1,the mileage seems to have went up a hair,and il on it more than ever,conmstantly rolling in it slightly,to hear that turbo whine. It may be me,but it seems like all the things i did,none of them affected it much,except the B1,I guessing i picked up 1 mpg,ill have ot keep track og it now. My average has been 14-16 lately,seems to be up to 15-17 now.

 

[Huff N Puff]

Biggest factor In MPG is how you drive it

I montored my milage pretty closely before my mods. The best I got driving gently was 19mpg highway . After the the modifications,and I consider my truck pretty heavily modifiyed. Driving gently I'm able to consitantly get 22. 5 highway. All that goes down the tubes when I put my foot into it.

 

[HC]

I also noticed in the TDR that one article indicated that the cetane levels in diesel fuel varied more in the midwest than in any other part of the country. I wonder if this is what we are seeing on a tank by tank basis?

I'm sure that's at least some part of it. But I've even tried to control that by buying fuel at the same station, and I can generally judge when they've gotten a new batch of fuel by the price swings. I think that speed is the biggest factor; even when your top speed is the same (say, 70 mpg), each tank varies on how long you spent stuck in traffic behind folks who were going only 60 mph. And even a very light headwind or tailwind is equivalent to driving 5 mph faster or slower; but a 5 mph wind is just a light breeze you wouldn't normally even notice.

 

[slo-ryde]

Lots of good info! My first tank of fuel netted 18. 41 mpg. Second tank gave 19. 09 mpg. Truck has 1500 miles on it. I'm hoping to see 20+ mpg after the motor is broken in. I'll think long and hard before succumbing to the BOMB bug!

 

[HC]

slo-ryde



If you don't hit 20+, I'll be very surprised. If you don't get it by 5k, then at about 15k switch to synthetic oils. If you're still not there, spring for a set of 275 RV injectors, and avoid the temptation for aggressive mud-terrain tires, major lifts, etc.

 

[slo-ryde]

Originally posted by HC

slo-ryde



If you don't hit 20+, I'll be very surprised. If you don't get it by 5k, then at about 15k switch to synthetic oils. If you're still not there, spring for a set of 275 RV injectors, and avoid the temptation for aggressive mud-terrain tires, major lifts, etc.

I'm feeling pretty good about the fuel mileage to date. Most of my driving so far has been geared around breaking in the motor. Lots of running through the gears, keeping the rpms up above 2000, no cruise control.



I haven't done any long freeway runs yet. I'd like to see 22 or 23 mpg on the freeway at 65mph with the cruise control on. Like I said, I'm already quite pleased with the fuel mileage.



I'm going to keep the motor stock if possible. I can already tell after just one visit to the local dealership that they love to find excuses for not doing any service. Voiding my warranty would make them squeal with delight!

 

[Mel Fuelling]

My 1st Gen weighs 9k on a daily basis as I work out of it. Threads

that I remember stated that best fuel economy occurs at 1,600

to 1,800 RPM. Not many of us have the opportunity to drive at

speeds in this range, but on summer fuel, I will see 19 to 20. 1

@ 65-70mph, 23@62mph, and twice(possibly not repeatable)

25@55mph. These were observed on summer fuel, cruise control,

and 2-7stops. The VE rotary pump on these older engines seems

to deliver the same economy under similar driving conditions regardless of fuel adjustments that produce 15 or 26# of boost. My normal traveling speeds on the interstates will produce 1#

of boost on level cruise and a maximum of 18-20# on the hills. This is with a 5sp, 3. 54 gears, 215-85x16 Michelins, and a cab

high Raven topper. So my fuel economy seems most closely

related to engine rpm and a square box pushing a lot of air.

 

[Devildog]

I realize that each truck has it's own quirks, However, I refuse to believe that two trucks with the same options will show extremely different fuel economy readings, + or - 1 MPG OK, but some of you guys are showing 4 -5 even 6 or more MPG than the others, I must believe driving habits and conditions are the main contributing factor to such high fuel economy. Where I'm at the terrain is flat, hot and humid and I only get around 12 MPG no matter how I drive.

 

[LSMITH]

Devildog, consider the maufacturing tolerances in the engine, transmission, transfercase, u-joints, wheel bearings, and rear end. One truck that happened to get a lot of them in the tight end of the tolerance will show more drag than one that is on the loose end. Next is the rigging of the truck. Alignment is a huge one, a truck that dog tracks presents a lot more surface for drag. Couple that with the fact that there is an allowable power output difference in engines built and you have the recipe for mileage differences well above 1 or 2 MPG. Lubricants are another area where mileage can be improved or hurt.



Not trying to convince you, only to give more info to consider.

 

[HEMI®Dart]

Observations running on Str8 #2

I didn't add anything to the tank last week when I filled up. Just plain Sunoco 40-43? Cetane.



Things I observed:



1. ) A marked increase in engine noise.

2. ) A marked incease in low boost/ low end smoke.

3. ) A marked increase in gallons of fuel used. I can't get an accurate MPG due to tall tires, but i'm at 1/2 a tank now where as I should be about 3/4. I may have gotten the Winter Blend already.