Gas mileage?
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Joined: Apr 2014
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Gas mileage?
Hey guys I was just wondering what you were all averaging for your trucks, reason I ask is mine feels abnormaly high. My trucks an 86 F250 HD 6.9 187k miles with a 4 speed and 2wd. I've been averaging around 20 around town and no more than 20 on the highway, it's city mileage I just don't understand how I'm accomplishing.
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This is about my 5th tank ( I run duals ) I write down current odometer when I fill up after runing it completely dry where the engine won't start, fill up and write down the amount of gallons along with my odometer reading and when I run out again I write down odometer reading subtract the two, get how Many miles I got and then divide by the amount I put in. That's how I've been doing it
Postmaster
Joined: Aug 2010
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From: Northern Arizona
Have you checked your odometer for accuracy, against a GPS for instance or at least highway markers? 20 mpg is not unheard of, but is very unlikely for city driving. Sometimes people get fishy calculations if a defective FSV returns fuel to the wrong tank but the symptom would be "missing" fuel from the tank being run, the opposite of high mileage.
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Joined: Apr 2014
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Ford F834 no I haven't checked accuracy of my odometer but I should now that you mention it, and I think the reason I'm get the mileage I'm getting (as long as my odometer it true) it's because around town I grant shift the truck, It rarely sees over 2k rpm and going 35 I'm already in 4th gear.
More Turbo
Joined: May 2009
Posts: 604
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From: Inman KS
guys guys guys.....seriously?? gas mileage? come again? you run gas in your trucks? LOL LOL
on another note, diesel is 80-90 cents higher than regular gas right now...really stinks!
on another note, diesel is 80-90 cents higher than regular gas right now...really stinks!
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I know but atlest in California and where I live it dropped from $3.97 a gallon to $3.55 a gallon in about a month's time.
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Cargo Master
Joined: Oct 2012
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From: California
20 mpg is not happening. Your odometer must be off. Or in your calculation, you are carrying an extra one. 
Tell me more about how you have eco-modded your truck? If you have done substantial tuning, modding, and customizing, then maybe you could get 20mpg in town. But if you just bought this IDI and you just changed the oil and air filter, then something is off.
My odometer is crazy off on my IDI van. So to calculate my mileage, I use google maps to duplicate my route on a long trip. Or we use the GPS, but that isn't always in my van.
Tell me more about how you have eco-modded your truck? If you have done substantial tuning, modding, and customizing, then maybe you could get 20mpg in town. But if you just bought this IDI and you just changed the oil and air filter, then something is off.
My odometer is crazy off on my IDI van. So to calculate my mileage, I use google maps to duplicate my route on a long trip. Or we use the GPS, but that isn't always in my van.
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Joined: Apr 2014
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What i have done is new return lines, clean injectors, replaced cracked injector lines, fuel filter, timing, adjusted the fuel screw and replaced the air filter and disconnected the fresh air tube. But i do need to check my odometer and see if its even remotely accurate, the interesting this is my shift points (I have a T19). I shift from 1st to 2nd at 10MPH, 2nd to 3rd at 20MPH and 3rd to 4th at 30MPH and with the speed limits in my town you really don't go over 35MPH. But again i need to check my odometer.
Fleet Mechanic
Joined: Oct 2012
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20mpg or a little over on hwy mileage is not unheard of, but 20mpg for city would be hard to do.
With my van on summer fuel I can consistently get in the 17-18.5 mpg range on highway driving. With mixed city driving I get 16-17mpg.
Check your odometer to make sure it is accurate. If you want more accuracy fill up at the same pump every time. No need to run it completely empty.....I usually go just below 1/4 of a tank on each and then fill up. If you have a smart phone there are some good apps that you can use to calculate and track mileage.
Winter time stinks up here. Dropped about 1-1.5mpg so far.
With my van on summer fuel I can consistently get in the 17-18.5 mpg range on highway driving. With mixed city driving I get 16-17mpg.
Check your odometer to make sure it is accurate. If you want more accuracy fill up at the same pump every time. No need to run it completely empty.....I usually go just below 1/4 of a tank on each and then fill up. If you have a smart phone there are some good apps that you can use to calculate and track mileage.
Winter time stinks up here. Dropped about 1-1.5mpg so far.
Postmaster
Joined: Oct 2005
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From: Clarksburg WV
I never got better than 13 mpg with mine on summer fuel, even after a new IP. However I didn't replace the injectors because the rebuilt injectors I got had something wrong with them, so that might have been part of the problem.
That was on a '94 turbo 4x4 5 speed with 4.10 gears and 285/75R16 tires.
That was on a '94 turbo 4x4 5 speed with 4.10 gears and 285/75R16 tires.
Fleet Mechanic
Joined: Oct 2012
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I never got better than 13 mpg with mine on summer fuel, even after a new IP. However I didn't replace the injectors because the rebuilt injectors I got had something wrong with them, so that might have been part of the problem.
That was on a '94 turbo 4x4 5 speed with 4.10 gears and 285/75R16 tires.
That was on a '94 turbo 4x4 5 speed with 4.10 gears and 285/75R16 tires.
I always got in the 13-14mpg range before. Replacing my worn IP/Injectors helped starting/power substantially, but no real mpg improvement. Then I added a low stall torque converter to my c6, added a DN overdrive, got an alignment, inlfated my tires to 80psi and slowed down some. I was able to consistantly get 17+mpg on my normal daily commute that would produce 13-14mpg before.
Your terrain can cause a lot of variation too. I do well on really flat ground or steep up/down hills. Slow rolling hills kill my mileage.
Postmaster
Joined: Oct 2005
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From: Clarksburg WV
It got 13 city or highway (though I didn't drive much highway). On winter blend it dropped to 11-12 mpg. I tried to keep the speed around 65 on the highway, still didn't seem to make much of a difference.
Not that it matters much now, that truck's been gone for 3 years.
Not that it matters much now, that truck's been gone for 3 years.