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4x4 gas mileage with the 300 I6

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Old 02-09-2011, 09:36 PM   #1
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Default 4x4 gas mileage with the 300 I6

Ok guys, honestly, I think I'm alone here cause no-one I know has a bullet proof engine like the 4.9L 300 I6.
I drive a 94 single cab long bed 355 gears and the M5R2 manual 5 spped. For the most part drive with hubs unlocked. 2500 rpm is usual shift point but the occasional 3000 - 3500 rpm shift is called for, seldom. I get a steady 9mpg?????????
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Old 02-10-2011, 03:56 AM   #2
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Originally Posted by smrtrbl86 View Post
Ok guys, honestly, I think I'm alone here cause no-one I know has a bullet proof engine like the 4.9L 300 I6.
I drive a 94 single cab long bed 355 gears and the M5R2 manual 5 spped. For the most part drive with hubs unlocked. 2500 rpm is usual shift point but the occasional 3000 - 3500 rpm shift is called for, seldom. I get a steady 9mpg?????????
Stop and go or highway? Tire pressure good? I have the I6 with the M5R2 and I get 17ish with a 70/30 mix. Hell, even towing I get better than 9MPG. Also, does it have dual fuel tanks? Mine was cross filling and made it appear that I was getting 10MPG.
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Old 02-10-2011, 06:37 AM   #3
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Haven't driven mine far yet, maybe 60 miles since purchase, so I can't really give you an answer as to milage. But it certainly seems better than that, and I'm in a 93 4x4 automatic. Inside 4x4 shift linkage is disabled so it's perma-2wheel mode.
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Old 02-10-2011, 09:16 AM   #4
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i've got a 92 300 I6 single cab 4x4 auto with a single tank 3.55 gears and i get about 12mpg thats all the time if i'm towing something, hualing something or going around in 4wheel drive its always about 12

i'm afraid to see what the monster is going to get when i get it done, it is a 95 300 I6 efi motor with an '79 4speed granny trans on 35's
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Old 02-10-2011, 08:52 PM   #5
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OK. Most of my driving is in a small rural town. Stop and go. But when I travel to Dallas its 75 miles one way and I still only get 9mpg. I have done regular tune ups, as in i have had the truck 1.5 years and do tuneups every 6 months. I also change the air filter regular too. I run synthetic oil and change a fram filter twice per oil change. I am running a 2" lift with 31x10.5 15's.
So any help would be much appreciated. I am ready to do a cam as well cause I really cant pull much without trying to burn the clutch out.
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Old 02-10-2011, 10:33 PM   #6
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OK. Most of my driving is in a small rural town. Stop and go. But when I travel to Dallas its 75 miles one way and I still only get 9mpg. I have done regular tune ups, as in i have had the truck 1.5 years and do tuneups every 6 months. I also change the air filter regular too. I run synthetic oil and change a fram filter twice per oil change. I am running a 2" lift with 31x10.5 15's.
So any help would be much appreciated. I am ready to do a cam as well cause I really cant pull much without trying to burn the clutch out.
Heh, what small town? I am in Kaufman, which is about 40 mile from Dallas. What air pressure is in the tires? The lack of towing power is weird too, my I6 is a stump puller even with 232K miles. Hell, I just recently towed a 4K lbs Chevy blazer and a 4K lbs chevy C1500 with ease. You might do some compression tests, see whats going on there.
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Old 02-11-2011, 09:50 AM   #7
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Mine's a 88 4X4 I6 Mazda 5 speed reg cab 2.73 open gears and 31x10.5/15, I get 16 mixed driving. With it locked in I get about half that. Would'nt trade it for the newest shiniest truck on the planet tho!
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Old 02-11-2011, 08:45 PM   #8
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I live north of Dallas 70 or 80 miles. Between Sherman and Gainesville. I have run 32, 35, and even 40 PSI in my tires. I never thought about blow by. But another thing is, I just fixed all my exhaust leaks today. That will probably help a lot.
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Old 02-11-2011, 08:49 PM   #9
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Stump puller. I'm pissed. Really. I tried pulling a dead cottonwood half eroded out of a creek last week, nothing. Stopped me in my tracks. No gumpshun. What so ever. And as I added in the previous post I did just fix all the exhaust leaks. It seems to have a lil more pep to it now. Not a lot but a lil more
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Old 02-11-2011, 08:56 PM   #10
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I live north of Dallas 70 or 80 miles. Between Sherman and Gainesville. I have run 32, 35, and even 40 PSI in my tires. I never thought about blow by. But another thing is, I just fixed all my exhaust leaks today. That will probably help a lot.
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Stump puller. I'm pissed. Really. I tried pulling a dead cottonwood half eroded out of a creek last week, nothing. Stopped me in my tracks. No gumpshun. What so ever. And as I added in the previous post I did just fix all the exhaust leaks. It seems to have a lil more pep to it now. Not a lot but a lil more
Ah, you are north, I am south of Dallas. These trucks aren't 0-60 monsters, but mine will damn sure pull almost anythiing. More towing power than my mom's 90 5.7L chevy.
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Old 02-11-2011, 09:06 PM   #11
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Are you using both tanks to clock the mpg? Like another poster said the cross fueling will screw the numbers up. When using the rear tank my 95 will return fuel to the front tank. So to figure mpg I fill both tanks and use the front one first.
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Old 02-12-2011, 12:35 AM   #12
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the last time i ran both tanks to get a estimate i ran them both intill the low fuel light came on.

got about 550km out of both of them 85% highway.
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Old 02-12-2011, 12:59 PM   #13
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I have a 94, lifted 4", 32's, 3:55 gears, and get 13 highway(through the mountains/and a little off roading). I havent changed the air filter since I bought the truck, maybe a K&N will help a little.

Single fuel tank.
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Old 02-12-2011, 04:20 PM   #14
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Ok I never tried to scan it cause it never had any engine trouble or MIL lamp illumination. Tried to connect my Snap-on Verdict and couldn't communicate. Today I drug out a dusty box and got the Snap-on Modis out. I have no codes nor problems per say. It did say during the KOER test that it had unbalanced compression? Maybe that could be a small factor to the poor gas mileage???
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Old 02-17-2011, 07:27 PM   #15
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Quote:
Originally Posted by sdmartin65
Are you using both tanks to clock the mpg? Like another poster said the cross fueling will screw the numbers up. When using the rear tank my 95 will return fuel to the front tank. So to figure mpg I fill both tanks and use the front one first.
I never use the rear pump cause the guy I got it from said it didn't work. Besides who can afford to fill both
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Old 02-17-2011, 08:06 PM   #16
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I have a 91, 4x4, short bed, 3.55 gears, inline 6. I've had it since new. I have always gotten 12-13 mpg no matter how I drive (city, highway or mixed).
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Old 04-11-2011, 07:37 AM   #17
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Ok guys, I'm the one who originated the post. I was getting on average 9mpg. I switched to a 31x10.5x15 street tire and bumped up to 12-13 mpg. Now the most recent development is putting factory tires back on and resetting the psom. I put 235/75R15's and now get from 15mpg to 16.5mpg. Not bad huh?
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Old 04-11-2011, 07:37 AM
 
 
 
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