No telling what the dealer put in it - it might be E85. That's gonna get awful mileage. Wouldn't put it past them - it's a lot cheaper.

 

2010 Lariat Supercrew, 5.4, 3.55, 6.5 box 1,900mi = 12.2
I'm hand calculating this next tank, I'm at about half right now. It better get better than 12.2, it's about a 50/50 mix of highway and town.

 

In my area the alcohol blended gases are more expensive. I've read several articles about that being the biggest drawback of the blends is that the alcohol costs so much more than gasoline, although I can't recall if those were from local sources or national. I guess the price of the alcohol could change based on where you live in the country. Gas companies normally receive the straight gasoline form the main pipe then put in their additives locally.

 

If you are 50/50 highway / city, you should be getting much better than what you are reporting. Unless you are driving two footed with the right foot firmly planted.

I personally don't think the truck's computer calculates mileage very well at all. I have been hand calculating since day one and my overall averages are significantly better than what the truck is calculating.

 

wow just ran the first tank through and did the math and my display is off if my math is right. display says 11.1 mpg with my hand on math its like 12.5 so ill pay way more attention to the math from now on! granted it needs to brake in but i hope she at least hits 18's

 

That's interesting. It's opposite of most owners.

 

That's odd - everywhere else I've been they are cheaper, because of the tax break incentives. Here in MO, everything is 10%. I go over to Kansas and 87 octane pure is 5 to 10 cents more than 89 octane 10%. E85 is 20 to 40 cents cheaper than 87 everywhere I've seen it.

 

shotgunz: I like your spreadsheet! Can I get a copy of it from you, please!

Thanks!

 

Sure. Here's the blank spreadsheet. You can easily add columns to track the lie-o-meter, brand, station, etc.

You're welcome!

 

It could be that you are so much closer to the raw "fuel" supply for the alcohol that the transportation costs are less than in my area. Add to that I am in an area that is close to oil refineries (we have one of the largest in the country about 20 miles from my house) and we might have discovered the reason for the price differences. I keep forgetting about our oil refinery here.

 

Yep...I already drive by the tach. I must look like a little old lady driving becasue I'm the last one off the line. I make a serious effort to see just how much fuel economy I can get out of this truck. It's just that it's a big heavy truck.

I did find a way to make my normal fuel economy seem great. The trick is to buy a boat and pull that thing around two or three times a week. When you un-hitch it and your fuel economy shoots up a few MPG you'll feel great by comparison!

 

I have found that not using the cruise control makes a good difference in gas milage. The cpu is telling me 18.1 right now with a 4.6L 3V 4x4 SCREW I just got back from the beach where it was a mix of highway 65 to 75 mph speeds and rural roads 45 mph to 65 mph with traffic lights mixed in. I was up around 20 until we sat in some traffic on friday night getting to the boardwalk and of corse traffic coming home on sunday afternoon. But keeping it under 72 seems to make the best MPG, but fast enough to keep it in 6th gear (normally above 60) seems to work best. And my tank is telling me 619 miles to empty so its about .9 mpg off to hand calculation.

 

Guys! Careful about the oboard fuel AVG reading. It WILL calculate 0 into any low end readings. The way our Subaru calculates running MPG is way better then the f150 way.

Calculating zero into the mix is just not right.

 

I disagree, calculating in 0 mph is correct. If you are sitting at idle you are wasting gas not moving. Doing hand calculations does the same thing, miles driven divided by gallons filled.

 

2010 XLT 4x4
6 speed
Stock Tires
3.31 axle ratio
7,800 miles on it

Averaging 18.5 mpg on the highway, display reads 18.6. In town 16.5, display reads 17.0
Only modification is true duals with X pipe and Magnaflow 4" round 14" long mufflers. Current oil is Amsoil XL 5W20, no change in mileage noted from Motorcraft to Amsoil. Best highway mileage was 21.2 across Texas, no wind on a hot day.