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Old 05-24-2013, 02:20 PM   #337
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Originally Posted by ROBERT CROSS View Post
"averages around 12mpg towing and 25 mpg when not."

A 50% reduction when towing seems a little excessive.

I certainly don't get 25mpg when not towing, but only lose 2-4 when.

Bob
Bob, I have to think that is because the computes can retune the engine so dramatically, the Variable-geometry turbochargers give you a lot of flexibility. You can cut down the displacement but when you need the power you have to pour on the fuel. The big trick is developing the torque at low rpm. If all you are going to do is tow with the truck the Ecoboost is not the truck for you. If you use the truck as a daily drive and a weekend tow vehicle then it may be a good option.
Variable-geometry turbocharger - Wikipedia, the free encyclopedia
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Old 05-24-2013, 02:20 PM   #338
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Some people use the mileage numbers from the truck computer and some divide gallons into miles when we get gas. Truck computers have a reputation (confirmed in our SUV's and trucks) to overstate mileage. If I take the computer's word for it, I get one to two mpg better than simple math tells me, but I still have to buy gas in reality world.

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Old 05-24-2013, 02:23 PM   #339
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Old 05-24-2013, 02:32 PM   #340
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Originally Posted by Gene View Post
Some people use the mileage numbers from the truck computer and some divide gallons into miles when we get gas. Truck computers have a reputation (confirmed in our SUV's and trucks) to overstate mileage. If I take the computer's word for it, I get one to two mpg better than simple math tells me, but I still have to buy gas in reality world.

Gene
You are taking a leap of faith on what those gas pumps are telling you, if you don't trust the truck manufactures numbers why would you trust the gas pumps? Time to break out the certified gallon gas containers and get down to business. BTW My mileage is just what I was told so I have no I idea what you are talkng about, and yes I can do simple math. Sounds like the issue is with your computer.
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Old 05-24-2013, 02:49 PM   #341
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On the DIC, most can be calibrated. If properly set, tire height, gear ratio, they will usually be within .5mpg.
If you've changed tire size that kaputs it good 'til it's re-cal'd.

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Old 05-24-2013, 03:04 PM   #342
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Quote:
Originally Posted by ROBERT CROSS View Post
"averages around 12mpg towing and 25 mpg when not."

A 50% reduction when towing seems a little excessive.

I certainly don't get 25mpg when not towing, but only lose 2-4 when. 17%

Bob
25 mpg seems to be an above-average number for the truck, but the bigger disparity between towing and dead-heading for the DI turbo engine comes from the fact that unloaded on level ground you should be able to run with some manifold vacuum... then you're close to the numbers you could get with a normally-aspirated V6, because you're only using 50 hp or so to overcome aero drag and some rolling resistance.

Traveling similar average speeds but with a heavy foot or in variable-speed traffic with lots of acceleration back to highway speed will net MUCH lower fuel mileage because you'll be under boost much more of the time.

Towing a heavy trailer (even an aerodynamic one like our Airstreams) is going to keep you in the boost a lot to give you that feeling of having plenty of power, but TANSTAAFL.
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Old 05-24-2013, 03:53 PM   #343
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You are taking a leap of faith on what those gas pumps are telling you, if you don't trust the truck manufactures numbers why would you trust the gas pumps? Time to break out the certified gallon gas containers and get down to business. BTW My mileage is just what I was told so I have no I idea what you are talkng about, and yes I can do simple math. Sounds like the issue is with your computer.
The gas pumps are checked by every state periodically, so they should be pretty accurate. Certainly more accurate than the gas gauge which moves fast near full and empty and slowly in the middle. It would seem the computer is using the same inputs to get the averages.

I never said you can't do simple math, but it appears you are looking for a way to be offended.

Gene
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Old 05-24-2013, 04:04 PM   #344
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The computed mileage onboard does not use the fuel gauge. It uses the injector pulse width of the metered fuel. It is dead nuts accurate on the per gallon side of the equation. As Robert Cross said...on the miles side of the equation, there could be variance as tire wears down or if tires rolling radius or gearing has been changed without a recal.
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Old 05-24-2013, 04:12 PM   #345
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My odometer reads a little high—about 2.5 % for a long time, but less than 1% now that the tires are getting close to worn out. That's not enough to account for a 1-2 mpg difference. Other vehicles had the same variance. There seems to be no good reason these things shouldn't be accurate with all the computer whizbang stuff, so I can't explain it except the manufacturer wants me to think I'm getting better mileage than I am.

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Old 05-24-2013, 04:57 PM   #346
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I never said you can't do simple math, but it appears you are looking for a way to be offended.

Gene
Gene, I am not offended, I just don't think you conclusions are valid. You have been beating this same drum about the computer read outs being incorrect for as long as I can remember and you are stating your odometer is off. Those of who own these trucks aren't seeing what you claim.
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Old 05-24-2013, 05:10 PM   #347
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Must be a problem unique with those Toyotas.
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Old 05-24-2013, 05:12 PM   #348
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Originally Posted by Gene View Post
My odometer reads a little high—about 2.5 % for a long time, but less than 1% now that the tires are getting close to worn out. That's not enough to account for a 1-2 mpg difference. Other vehicles had the same variance. There seems to be no good reason these things shouldn't be accurate with all the computer whizbang stuff, so I can't explain it except the manufacturer wants me to think I'm getting better mileage than I am.

Gene
Maybe they do that over in T land, but not over here in C & G land. I wll say that you would have to do your pump math over many tankfuls to be accurate. A single tank fill at different pumps with different shutoff tolerances can result in as much as a gallon difference in "full". I don't buy into the state cert conspiracy theory.
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Old 05-24-2013, 05:13 PM   #349
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Must be a problem unique with those Toyotas.
I think you may be on to something.
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Old 05-24-2013, 05:16 PM   #350
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The computed mileage uses the injector pulse width of the metered fuel and is nuts accurate on the per gallon side of the equation.
Exactly!
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