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Old 08-11-2017, 09:21 AM   #1
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Gears, Speed & MPG

Our first three trips were fairly local. Never got above 55 mph due to the roads and my inexperience. My gas mileage was right around 10 mpg.

This last trip was to FL and open interstate speeds were 70 mph. I stayed right around 65 mph... just fast enough not to get run over.

At 65 the TV did not want to go in 6th gear. It preferred 5th gear. Mpg's were between 7 and 8. I did notice if I backed down to 62 mph the TV would go into 6th gear.

How do you all handle high speed roads on a two lane interstate? At what point does my slower speed become dangerous to the cars and 18 wheelers flying by me and coming up quick on my rear?

Thanks
Ron
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Old 08-11-2017, 09:27 AM   #2
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Ron, I'm new to this too. Here in the West with rural Interstate speed limits of 80-85 mph the disparity is even worse. Furthermore, I've found that my TV tows much more efficiently at 75 mph than it does at 65-70. What makes me nervous, however, is the cheap Chinese tires installed by Forest River on my TT that have a speed rating of 65 mph, and show a manufacture date of 4/2014.

I've always believed that it's safest to drive at or near the flow of traffic, regardless of what a speed limit sign says. I also am starting to show some uneven wear on one of those tires. So, I have a 10 a.m. appointment today with a trailer alignment specialist. I'm then replacing those tires with some N-rated Goodyear Endurance for peace of mind. Thereafter I'll be staying closer to the flow of traffic at ~75 mph.
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Old 08-11-2017, 09:32 AM   #3
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This will be an interesting thread.
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Old 08-11-2017, 09:38 AM   #4
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Yes prepare to become the villain . Folks in here are real touchy when it comes to speed .
As for what gear your seeing when towing depends on the grade. I personally would rather have higher but still safe RPMS that keep me in the sweet spot as far as power goes . I think its actually easier on the engine and transmission . If you wanted 20 mpg you should have picked a different hobby .
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Old 08-11-2017, 09:44 AM   #5
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It's not how fast you go, but rather arriving safely and without incident!

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Old 08-11-2017, 09:47 AM   #6
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Quote:
Originally Posted by Ron045 View Post
Our first three trips were fairly local. Never got above 55 mph due to the roads and my inexperience. My gas mileage was right around 10 mpg.

This last trip was to FL and open interstate speeds were 70 mph. I stayed right around 65 mph... just fast enough not to get run over.

At 65 the TV did not want to go in 6th gear. It preferred 5th gear. Mpg's were between 7 and 8. I did notice if I backed down to 62 mph the TV would go into 6th gear.

How do you all handle high speed roads on a two lane interstate? At what point does my slower speed become dangerous to the cars and 18 wheelers flying by me and coming up quick on my rear?

Thanks
Ron
Those other drivers also have a responsibility to adjust their speed, not just you. Drive the speed you are comfortable with and don't let faster drivers pressure you. A slower camper is not a danger to an attentive driver. Just relax and do your thing.

Just my .02.
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Old 08-11-2017, 09:48 AM   #7
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Speed is your enemy when towing. Most ST tires have a max speed rating of 65 that should not be exceeded. I believe that unmanaged tire pressure and over speeding ST tires is the leading cause of blowouts. Check your tires max speed rating. 65 is fast enough for me. If your TV is hunting gears or RPMs are low you should go to a lower gear and leave it there. There is a RPM for your engine where you will get the most efficiency.
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Old 08-11-2017, 10:00 AM   #8
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If you wanted 20 mpg you should have picked a different hobby .


It's not that I want 20. I just thought it was interesting that I went from 10 to 7 based on speeds that increased from 55 to 65.
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Old 08-11-2017, 10:13 AM   #9
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It's not that I want 20. I just thought it was interesting that I went from 10 to 7 based on speeds that increased from 55 to 65.

My apologies I sounded a little rude when I typed that .

Had to rewrite after I typed out my last response I reread your first post and I lean toward wind resistance being the enemy that was causing you not to get 6th gear. Usually for me I like to keep it down a gear where I have good power and am not over revving then engine .
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Old 08-11-2017, 10:23 AM   #10
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The engineering answer: non linear equation.

Also remember that every engine has its own power curve, every trailer has its own surface area and airflow resistance dynamic, and you get mpg all over the board.
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