Coldhill

I have a 1998 2500 24valve cummins, which I get about 23-25 mpg already.

There is no accesories on this truck other than bigger tires.
I want to get as much fuel efficiency as I can.
Where do I start, and how much will this cost me?
I have the money, but do not want to spend too much... Lets say, Under $1500.cnd.

I was told a chip around 60 hp would help out greatly on the hwy, but might suck back the gas in the city. Is this true or false?
Any help would be great. I suppose I should mention, I don't know squat about mechanics.

Thank you in advance!!!!

CH

chuxtruk

33?? MPG??? Maybe 23 but probably never would you be able to squeeze 33 mpg out of one of these CTD trucks. Too heavy etc, etc, etc. But I would think that by adding some things like an upgraded air box, a 4 or 5 inch exhaust system and maybe that 60 hp chip would work too but that should improve whatever mileage you're now getting. I've done all that to my truck plus had the valves adjusted and everything else I could think of and I'm getting just over 21 mpg on a 60+ mile daily commute. And I'm VERY HAPPY with that!!
The air box was about $250, the Diablo 50 hp chip like I run is now $165 and the 4 inch MagnaFlow stainless exhaust ran me just over $500. So for the performance you get from what I described, the price is reasonable. Well under $1000 and everything is EASY to install. Of course you could spend more. Your choice. Good luck!!

Adam3291

Hint of advice, never believe the stupid computer (trip computer), it has the tendency to lie all the time, the only accurate way is to hand calculate it.

smokindog

You sure you don't mean KM's/L???

23-25mpg is a serious stretch for a stock truck especially if you have larger diameter tires than the factory 245's.

The best hand calculated I was ever able to get when my truck was stock is 21.4mpg and that was with just shy of 150K miles.

kas83

If he did, he'd already be getting his 33 mpg and then some. Remember that there are almost 4 liters per gallon.

I think 25 mpg is possible with the right truck and driver. Very easy on the throttle, cruise at a little slower speed, etc etc. Driving habits have such a large outcome on economy, that I do believe it is possible, but not probable.

crankbender

Don't forget that Canadian's use Imerial gallons wich are larger than US gallons.

The best I get on the highway is 24mpg normaly 22. If you are getting 24 you are already doing good.

Is your odometer calibarted for the larger tires?

Need95-00CTD

Imerial Gallons? You mean Imperial Gallons? I thought they all used liter's, so is it 4 litre's to a gallon then? Like 4 quarts to a gallon here? And I thought the U.S. System was Imperial? Man I'm confused now...

smokeyram

just did some quick math, after a good amount of driving yesterday. I put 20 gallons in yesterday morning, put 455 miles on as of this morning.comes out to just under 23 mpg , and no fuel light as of yet. this was traveling at steadily at 2100 rpm, around 80 mph.

WildBill

I saw an article in one of the Diesel magazines a while back where a guy maximized his truck for economy. He lowered it, added a front air dam, and a tonneau type thing that went from the top/back of the cab down to the back of the bed, and he got 25 mpg or so. Can't remember which brand truck though. I would think that if you put on an Edge EZ, drive easy, and don't go over 100-110km/h those would be the most cost effective things to do.

crankbender

Imperial ? No, Imerial....it's new.

phox_mulder

First off, get your speedo/odometer calibrated to those tires, then see what you're currently getting.


phox

1320

If yu have taller tires and its not calibrated, then lets say your odometer is off 10%....then you only went 410 miles not 455. So your mileage is actually lower then the 23 calculated, unless your already calculating those differences.


I got 108.6 mpg the other day.......in my honda insight.

gyman98

We use imperial gallons which are 4.54 litres. The US uses US gallons which are 3.78 litres and are totally different from the rest of the worlds gallons. To convert a US mpg to Imperial you multiply by 1.2 so 23mpg US is 27.6 Imperial MPG.

wcbcruzer

You're already getting near max fuel economy. Bump up the timing (via performance box, I couldn't tell you which one), get RV275 injectors, get 235/85/16 tires (properly inflated), switch to synthetic oils all over, make sure everything engine related is within factory spec (everything from idle speed, to intake boots being tight, etc.), and if you have an automatic get a more efficient torque converter. That's about the best you can do as far as mods to achieve the best fuel economy. The rest is in your highway speeds and right foot. Even if you're talking imperial gallons, 33 mpg is equivalent to 27.5 miles per US gallons. That is impossible. BEST is about 23 US mpg. Good luck!

gunracer1

i built my little truck to get max fuel economy, hence the 30 of the 11:30 name. i have done 27mpg, but the truck is lowered and lightened up over a standard truck. i would really like to put in a set of 3.07 gears in the rear.