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Old 04-28-2016, 12:47 PM   #11
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9-10MPG is great... I get about 7, but I have the 35 gal tank size and a small 5.2 liter engine...
go to local tire dealer (IF you need tires anyway) and find out what stock size tire is AND circumference of that tire. Smaller tires will be like upping the rear gear ratio which might be a good thing as 3.73, 4.10 and up are considered towing ratios, not 3.55.

I find I get better fuel economy with OD off... I used to manually cycle it on/off depending on terrain, but find it easier to leave it off and I get about 1/2 gal better fuel economy that way.

When you figure the current and projected price of gas... the extra $$$ you put in the tank won't be nearly as mcu as a bigger car payment.

Easy check on speedo accuracy is to drive at 60 MPH and click off 1 mile on interstate mileage markers... 1 mile should take 60 seconds.
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Old 04-28-2016, 12:47 PM   #12
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We tow the same trailer with a 1500 Suburban and that is probably about the mileage we get. We are planning a long trip this summer and what we save by camping vs hotels and eating in vs eating out will more than make up for the gas we spend. Even if it didn't we would still camp because that is what we enjoy. Take a deep breath and just enjoy it all. Good luck!
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Old 04-28-2016, 12:49 PM   #13
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How large is your gas tank? You should figure roughly 10.5 to 11 mpg. If your tank is 22-24 gallons that's about normal consumption.
My tank is 26 gallons so maybe 7.5 mpg is the best the 5.4 can do towing. Previous owner had it all decked out for towing when I bought it - maybe that's why he got rid of it - just couldn't do better no matter what he threw at it


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Old 04-28-2016, 12:55 PM   #14
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9-10MPG is great... I get about 7, but I have the 35 gal tank size and a small 5.2 liter engine...
go to local tire dealer (IF you need tires anyway) and find out what stock size tire is AND circumference of that tire. Smaller tires will be like upping the rear gear ratio which might be a good thing as 3.73, 4.10 and up are considered towing ratios, not 3.55.

I find I get better fuel economy with OD off... I used to manually cycle it on/off depending on terrain, but find it easier to leave it off and I get about 1/2 gal better fuel economy that way.

When you figure the current and projected price of gas... the extra $$$ you put in the tank won't be nearly as mcu as a bigger car payment.

Easy check on speedo accuracy is to drive at 60 MPH and click off 1 mile on interstate mileage markers... 1 mile should take 60 seconds.
Speedo doesn't match the TomTom, so we know it is off, and also doesn't match the GPS app I put on my phone. I did verify stock tire based on VIN, and spoke to dealer and tire shop ( dealer told me they will beat any tire shop pricing by 1.00 )

The wife and I were trying to decide if the rule about O/D off when towing still applied with modern vehicles.

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Old 04-28-2016, 12:56 PM   #15
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Yep, on a good day I get 11.5 mpg pulling a 26 footer.
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Old 04-28-2016, 01:16 PM   #16
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That's why I traded the f150 for a low milage f350. Of course that led to buying a fiver. The f150 5.4 just isn't a great truck for the trailer you are pulling. Hill country will take a heavy toll.
I had an F-250 5.4 with tow package and it was the worst TV I have ever been in. Crapping mileage(tow and no tow) and no towing umph.
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Old 04-28-2016, 01:16 PM   #17
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Hmm, if it has the factory tow package, does it also have a button for a tow mode? Might not need a different tune chip if it's already built into your truck.

But, for reference, my 1500 only gets about 9 mpg when towing, (17 otherwise as I do mostly highway between work and home). But if I forget to turn on the tow mode, that 9 mpg usually ends up closer to 8 mpg.

In the long run though, 8 vs 9 mpg isn't much of a difference compared to the 48 mpg I used to get with my old Saturn. But I couldn't sleep 6, cook meals and shower in a Saturn, so this is the trade off.


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Old 04-28-2016, 01:24 PM   #18
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"In the long run though, 8 vs 9 mpg isn't much of a difference compared to the 48 mpg I used to get with my old Saturn. But I couldn't sleep 6, cook meals and shower in a Saturn, so this is the trade off".

Well said.
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Old 04-28-2016, 01:26 PM   #19
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I have just about the same set up, and as others have mentioned, probably best just spending the money on gas and keeping the speed around 65 mph. Going 70+ really cranks up rpms and really decreases the mpg. Hills definitely kill the mpg. I live in central Virginia, heading towards the beaches, most of the trip being very flat, I can actually set the cruise control and have gotten 11 mpg towing my Roo. Heading west towards the mountains, or Southwest to one of the lakes we camp, being very hilly, mpg drops to eight or nine, plus I have a lot more control on shifting if I simply don't use cruise control when hilly.
Good luck! Congratulations on the new Roo, you will love it.
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Old 04-28-2016, 01:28 PM   #20
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Currently at 65 mph the RPMs level out and aren't constantly shifting up and down and we are running about 3300 RPMs on the flats <- This seems high to me for a truck that runs 1800-2000 without towing and about 2200 towing a 12' box Coachman Pop-up camper( 3200 loaded ) prior to the Shamrock.

My tires themselves are 3" bigger than the stock tires 285 vs 255 70/r17s.

The dealer said the adjustment to tire size to speedo probably wont do much, but putting the factory tires back on or changing the rear differential will help a lot ( he was happy to sell me new tires or another truck if I wanted one as well )

3300 rpms on flat ground does seem high - and explains your drop in mileage. We pulled our 2800 pound popup for a year with the F-150 before getting the Roo. Night and day difference because of the giant square front on the Roo. The shape / size is more of an issue than the increased weight your pulling.

I think that the current tire size may be the biggest issue. And are you sure its a 3.55 ratio? I thought any f-150 with the factory tow package got the 3.73. But going smaller on the tire size will effectively increase your gear ratio. I can tow 65 on flat ground at 2200-2300 and get 8mpg or so.

I don't think you'll ever get this combo to 10mpg, but seems like maybe the prior owners mods might be part of the issue.

And my next truck will have at least a 34 gallon tank for sure. Glad to see Ford is offering bigger tanks on all the new trucks. 2017 F-250 cc long bed has a 48 gallon tank. That would fix the stop every 2 hours problem! Of course then we would need a new thread to complain about the cost of fill-up.
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