gas mileage

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Jun 17, 2010
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So I try to drive my 100 very easy to see if it has better mileage than my 80 but the difference is not very noticeable at all. In my 80 I would average 210 to 230 miles per tank and In my 100 if I am lucky I'll get 245 - 250. Are you guys getting more or less the same mileage?

Thanks,
 
Yeah, very similar running 87 octane.
 
First of all, miles per tank is a horrible way to calculate mileage. Figure out the mpg and report back. And go through several tanks and average them out.

FYI, most cars are gauged to go ~300-400 miles per tank of gas. That doesn't mean they get the same gas mileage.
 
First of all, miles per tank is a horrible way to calculate mileage. Figure out the mpg and report back. And go through several tanks and average them out.

FYI, most cars are gauged to go ~300-400 miles per tank of gas. That doesn't mean they get the same gas mileage.

I'm not trying to figure out MPG just wanted to have a vague idea of how many miles per tank the rest of you are getting
 
The 98-02 100 gets about 1 mpg more than the 95-97 80 series and the fuel tanks are about the same size.
 
So I try to drive my 100 very easy to see if it has better mileage than my 80 but the difference is not very noticeable at all. In my 80 I would average 210 to 230 miles per tank and In my 100 if I am lucky I'll get 245 - 250. Are you guys getting more or less the same mileage?

Thanks,

If by some miracle you actually can run your tanks down to exactly the same level, then you're getting ~10% better mileage from the 100. Sounds about right, maybe just a tad low, but as someone mentioned, you really need to calc MPG...
 
I get around 400 miles per tank in the summer driving slow. In the winter I get around 325 miles per tank but I live in Wisconsin and let it warm up a lot. I figure I get around 17mpg on average and around 13.5 towing my boat.
 
I get around 400 miles per tank in the summer driving slow. In the winter I get around 325 miles per tank but I live in Wisconsin and let it warm up a lot. I figure I get around 17mpg on average and around 13.5 towing my boat.

that is really good mileage for a 100! I can't imagine getting 400 miles on a tank. Isn't it a 25.4 gallon tank? How long was the fuel light on?

Even driving a steady 55 on my benchmark run to the beach house yields a comfortable range of 300-325 miles. But it's not a DD so I can profess to being intimate with how far to push the range.
 
I check the mileage about everytime I fill up...use 89 octane (Ethanol), we don't have anything north of 91 octane here, and 91 didn't seem to make a difference. City/Highway, 35/65.

Tank: 280-320, generally. No light ever comes on - I fill up b/f then.
MPG: generally around 15-16 mpg., give or take. Once upwards of 17-18 when had a slight tailwind on a trip, 65 mph; and, once around 11 when had a menacing headwind on a trip, 65 mph.
 
I tend to get around 280-300 miles in mixed driving on a tank. I am sure that just like my '04 thi sone will drop as the truck gets taller and heavier. I am using mid-grade gas.

400 per tank? Wow! Never been close to that.
 
I'm not trying to figure out MPG just wanted to have a vague idea of how many miles per tank the rest of you are getting

That's exactly my point. How do you know what people mean by "per tank"? Till completely empty? Fuel idiot light? It is too inconsistent to use the per tank method. MPG is what needs to be used. And even that is still inaccurate in itself. (but not as much as MPT).
 
I have the stock size 275's on it. I also drive 80% highway. I baby it quite a bit also and try to get gas within 30 miles or so of the gas light coming on. I also use superclean which gives me noticeably better mileage. I don't have a roof rack or anything else on it either and the 3rd row seats have been taken out. I need to get gas tonight so I will report back on the latest mpg.

BTW- I usually fill up my tank to the point where it almost starts coming out. The next time I fill up I divide how many miles I've driven by how many gallons I put in the 100. For example if I drove 380 miles and I filled my tank to the point where it almost overfills let's say 22.5 gallons I divide 380/22.5=16.888

It seems pretty accurate.
 
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Took trip this week to NC......

Took readings four times on way up to Boone and averaged 13.9mpg going 70mph at around 2400 rpms except after I got into mountains and things slowed...plus I sat in traffic on interstate for 2 hours with engine running while they removed a wrecked, flipped and scattered remnants of semi that went sideways and off road.

Did it again today on way home...same route minus the overturned truck with 2 hours of parking on interstate in this heat....averaged 16.3mpg driving 60-65 at 2000-2100 RPMs.

This is with five VERY HEAVY Nitto Trail Grapplers...tire and wheels together are about 90# each....full load of hunting gear in rear cargo area....suitcase and business stuff in rear seat area...and running air conditioner front and rear the entire trip nearly except for up in mountains.
 
My truck is stock... Only city driving I average about 230-240 miles to the gas light (sometimes sooner, but that averages about 11 mpg or something)

Mixed city highway I average 12.8-13.3 (270-280 miles)

Only highway I once got about 400 miles (over 18mpg) but average about 350/tank without towing.

12.5 mpg average towing 2000lb trailer plus loaded rig on highway 260-270 miles/tank.


My old 80 I NEVER ONCE cracked 12mpg. I averaged 10, and got about 11.5 highway. That's it. So I get at LEAST 20% better fuel mileage with my 100 vs my 80.
 
i'm interested to see what kind of data we get out of the 25 or so folks who purchased the DT headers.

rumor on the street is that a ih8mud sticker is good for another 2 mpg. is that true? ;)
 
Took trip this week to NC......

Took readings four times on way up to Boone and averaged 13.9mpg going 70mph at around 2400 rpms except after I got into mountains and things slowed...plus I sat in traffic on interstate for 2 hours with engine running while they removed a wrecked, flipped and scattered remnants of semi that went sideways and off road.

Did it again today on way home...same route minus the overturned truck with 2 hours of parking on interstate in this heat....averaged 16.3mpg driving 60-65 at 2000-2100 RPMs.

This is with five VERY HEAVY Nitto Trail Grapplers...tire and wheels together are about 90# each....full load of hunting gear in rear cargo area....suitcase and business stuff in rear seat area...and running air conditioner front and rear the entire trip nearly except for up in mountains.

Gives you a combined hwy MPG of 15.0, assuming same mileage each way.
 
For those of you with internet capable phones, using fuelly.com at the pump is a very convenient way to track mileage as well as fluctuations in gas cost (if you care).

rumor on the street is that a ih8mud sticker is good for another 2 mpg. is that true? ;)

Sh*t if thats true then I'm gonna throw one on my Yukon before I even get the Hundy! :D
 
I drove 260 miles then filled up 20gallons, so I got 13mpg with 305's, I lost about 1 mpg since going up to 305's
 

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