How to get best MPG?
#1
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How to get best MPG?
How do you get the best mileage out of a first gen.
I have a 91d250 non i/c, 3.00 rearend, full 4inch from turbo back, 3kgsk, timing at 16.5, couple turns on fuel screw, custom fuel pin and bahaf. I know driving with a light foot, and less than 5psi of boost helps, but is there anything else??
I have a 91d250 non i/c, 3.00 rearend, full 4inch from turbo back, 3kgsk, timing at 16.5, couple turns on fuel screw, custom fuel pin and bahaf. I know driving with a light foot, and less than 5psi of boost helps, but is there anything else??
#2
Park it and don't drive it.
Thank you, thank you, I'll be here all week.
Cummins says keeping EGT under 700* and boost under 10 psi is best for fuel mileage. It was in an old issue of the TDR my brother had form a few years back.
Thank you, thank you, I'll be here all week.
Cummins says keeping EGT under 700* and boost under 10 psi is best for fuel mileage. It was in an old issue of the TDR my brother had form a few years back.
#6
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make sure your tires are balanced and wheels are aligned. A fresh coat of wax, nicely polished, with rain-x on the window. You may see 1-2 mpg increase. I think there is an adjustment you can do to the trans if its an auto... if its manual idk. Something else i've noticed a pick up on... fresh oil in the rears, synthesis works well but sometimes leaks right back out. i stick with the dinosaur oil.
#7
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Non aggressive properly inflated tires roll a lot easier than the big oversized aggressive ones. Running the engine much over 2000 RPM's also makes your fuel mileage drop.
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#8
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A tighter torque converter will help and shedding a few pounds will too. The truck not you. . Drive like you have a raw egg under your right foot and you don't want to break it. Stay below 55mph.
#9
Registered User
Run alcoa aluminum wheels, 235/85/16 tires with lots of pressure. Swap in a ford 9" rearend to shave a couple hundred pounds. Put on a small spoiler below the front bumper about 4" tall. Close any gaps on the front end with tape. Aerodynamics play a big difference. Cut holes in the rear bumper to allow air to escape.
The biggest difference will be how you drive. Using the brakes is wasting energy.
The biggest difference will be how you drive. Using the brakes is wasting energy.
#10
Aluminum wheels and skinny tires will help.
No, no, no and no.
A ford 9" takes just as much HP to turn as a Dana 60/70. Not to mention its a weaker differential.
The front spoiler isn't going to increase aerodynamics of these trucks by any worthwhile amount. The added weight and VERY limited effect would most likely hurt more than help. Lowering the truck may help, as it will reduce the initial air deflection by a small amount. Bottom line is these trucks are bricks. They are NOT aerodynamic. Live with it.
Holes in the rear bumper will do NO good.
Aerodynamics doesn't really come into effect on a vehicle until approximately 60mph or so anyhow, so if you want to save fuel, keep it under 60mph. A tonneau cover can help as it streamlines the air flow over the bed a little.
True!
A ford 9" takes just as much HP to turn as a Dana 60/70. Not to mention its a weaker differential.
The front spoiler isn't going to increase aerodynamics of these trucks by any worthwhile amount. The added weight and VERY limited effect would most likely hurt more than help. Lowering the truck may help, as it will reduce the initial air deflection by a small amount. Bottom line is these trucks are bricks. They are NOT aerodynamic. Live with it.
Holes in the rear bumper will do NO good.
Aerodynamics doesn't really come into effect on a vehicle until approximately 60mph or so anyhow, so if you want to save fuel, keep it under 60mph. A tonneau cover can help as it streamlines the air flow over the bed a little.
The biggest difference will be how you drive.
#11
#13
Registered User
Aluminum wheels and skinny tires will help.
No, no, no and no.
A ford 9" takes just as much HP to turn as a Dana 60/70. Not to mention its a weaker differential.
The front spoiler isn't going to increase aerodynamics of these trucks by any worthwhile amount. The added weight and VERY limited effect would most likely hurt more than help. Lowering the truck may help, as it will reduce the initial air deflection by a small amount. Bottom line is these trucks are bricks. They are NOT aerodynamic. Live with it.
Holes in the rear bumper will do NO good.
Aerodynamics doesn't really come into effect on a vehicle until approximately 60mph or so anyhow, so if you want to save fuel, keep it under 60mph. A tonneau cover can help as it streamlines the air flow over the bed a little.
True!
No, no, no and no.
A ford 9" takes just as much HP to turn as a Dana 60/70. Not to mention its a weaker differential.
The front spoiler isn't going to increase aerodynamics of these trucks by any worthwhile amount. The added weight and VERY limited effect would most likely hurt more than help. Lowering the truck may help, as it will reduce the initial air deflection by a small amount. Bottom line is these trucks are bricks. They are NOT aerodynamic. Live with it.
Holes in the rear bumper will do NO good.
Aerodynamics doesn't really come into effect on a vehicle until approximately 60mph or so anyhow, so if you want to save fuel, keep it under 60mph. A tonneau cover can help as it streamlines the air flow over the bed a little.
True!
A 4" lip on the bottom of the front bumper would weigh maybe 2 lbs and would make a difference at highway speeds. A full belly pan would be best. If it can make a difference on a tdi or civic it would make a difference on a truck. Not huge but everything adds up. Same with the rear bumper. Its like dragging a small parachute if you think about it. You add .2mpg here .5mpg there and they all add up. Yes these trucks are aerodynamic as a brick but doesn't mean there aren't improvements to be made.
Camshaft plays a large role in mileage for the engine. Friction coating bearings, thermal coatings on pistons and head ports to keep heat in the chamber.
In the end it all comes down to money. 9 times out of 10 you are better off just living with what you have and driving with an egg under your foot
#14
Get a gear vendors and drive 55 mph.
With my 727 I've gotten:
19 mpg 70-75mph
23 mpg 60-65mph
27 mpg 50-55 mph
Aired up tires help, so does a grille block and electric fans (about 3 mpg gain) if you don't tow and can live feeling like your truck is overheating all the time. (note-when I did it, it never actually did overheat, but it ran a lot warmer)
With my 727 I've gotten:
19 mpg 70-75mph
23 mpg 60-65mph
27 mpg 50-55 mph
Aired up tires help, so does a grille block and electric fans (about 3 mpg gain) if you don't tow and can live feeling like your truck is overheating all the time. (note-when I did it, it never actually did overheat, but it ran a lot warmer)
#15
A 4" lip on the bottom of the front bumper would weigh maybe 2 lbs and would make a difference at highway speeds. A full belly pan would be best.
If it can make a difference on a tdi or civic it would make a difference on a truck.
Not huge but everything adds up. Same with the rear bumper. Its like dragging a small parachute if you think about it. You add .2mpg here .5mpg there and they all add up. Yes these trucks are aerodynamic as a brick but doesn't mean there aren't improvements to be made.
Camshaft plays a large role in mileage for the engine. Friction coating bearings, thermal coatings on pistons and head ports to keep heat in the chamber.
In the end it all comes down to money. 9 times out of 10 you are better off just living with what you have and driving with an egg under your foot
I was looking into the possibility of a GearVendors OD for my truck...but at $3k, it would take me 10 years of driving to start saving any money. (truck is not my daily driver) Fuel would have to get over $5 a gallon again to make it even remotely cost effective.