Interstate cruising speed

[007matman]

Originally Posted by Jim34RL

Yes, I am not stock either I am using a Smarty S67 programmer on my truck. CaTCHER level 3 adds 60HP/120TQ measured at the rear wheels over stock which I tow at. I can go all the way up to 170HP/350TQ as measured at the rear wheels over stock if I wanted to.

That is why I watch all of my gauges as I am towing my trailer. This includes EGT's, Boost, Transmission temps, oil pressure, coolant temps and engine rpm's.

If it is a Ford 6.0L and a 6.4L engine it is never built proof, it is a Ford by the way. You know what they say don't you, 90% of the Fords built are still on the road today, the other 10% did make it home.

That's your opinion on the 6.0.. not fact. And you know nothing about the mods I've done to make it that way. 6.0's can be very reliable if a few items are addressed.

I'm not going to get into this peeing match with you.

[scottnlindsay]

60-65, I would rather be passed then to be the one passing all the time. Especially if there is a good wind.

[The Evil Twin]

Originally Posted by 007matman

As fast as I want to.

I can get 12-14 MPG all day with my F350 Turbo-diesel.

Typically, it's about 70 but if traffic is pushing I'll go a bit faster. Save me the lecture on china-bombs.. they do just fine. Just gotta check the tire pressure and swap them out every 3 yrs.

A man after my own heart My total trailer towing mpg is 12.9 for a 12-13k lb trailer. She purrs along at 1800 rpm and <800°f EGT's.

Although I will say I do not typically exceed 75 since the tires are speed rated at 81 for a 4000 lb load.

[Teetime]

Originally Posted by BehindBars

Same here. 62-65 MPH is a safe and economical speed for me on interstate highways.

Yes, same here!

It may depend on what your rig is or you towing capacity, but I like to take it easy on my trips. We could tow about twice our max combined weight, and travel faster, but why the added stress? We can watch the hot rods go by, relax and enjoy the trip.

In congested areas, maintaining a reasonable speed helps finding gaps in the traffic for lane changes.

[mjacxx]

Originally Posted by MainelyUS

The 3500’s sweetspot is 66-67 when hauling

+ 1 with my F250 6.7

[david_reaves]

I run at about 70mph when the conditions allow it. If there is a high wind and/or heavy truck traffic on poor quality highways (like I-20 in Louisianna or I-40 in western Tennesee) I will drop to 60-65mph. I put somewhere between 15-20K miles on the camper every year traveling cross country. When you are driving 8-10 hour days the extra 5 mph makes a difference.

I admittedly have a fairly light trailer (8500 lbs) on load range E tires with a Ram 3500 SRW, 6.4L Hemi.

[tande]

Originally Posted by 24_Byron_fan

It depends who's with me. 65mph tops with the family just because they'll whine at me if I drive slower. If I'm alone I'll go as slow as 55mph. Life is easier when you're not in a rush. My TT's tires are rated for 75mph and my truck has no problem holding that speed with everything fully loaded for a trip but the mileage is only 8mpg. I'd rather back it off to 55mph and get 11mpg. I'd rather get that 100 extra miles out of the tank than arrive a few minutes early.

I have a 2018 F150 3.5EB with the 36 gal tank towing a Salem Cruise Lite 282QBXL.

Yup! ......I too have long since quit seeing how many seconds I can shave off my arrival time!.....but....

[old40ford]

Originally Posted by aceinspp

X 2 definitely get better mileage. Later RJD

What they said.

[Justice12t]

Silly question...???

Where did this magical 65mph limit come from? Like really come from not just opinion? Taking MPG's out of the conversation...

Is it because of what the side wall of the china bombs say from factory? Or something else?

Because like so many others, my tires are rated above 65mph, actually 81 I think. I'd never go that fast, I am just curious as to where this number came from...

[babock]

62-65 MPH with my adaptive cruise control on. Makes the trip a lot less stressful.

Nice thing about being retired, it doesn't matter if I get there 15 minutes earlier.

[Mike134]

Originally Posted by Justice12t

Silly question...???

Where did this magical 65mph limit come from? Like really come from not just opinion? Taking MPG's out of the conversation...

Is it because of what the side wall of the china bombs say from factory? Or something else?

Because like so many others, my tires are rated above 65mph, actually 81 I think. I'd never go that fast, I am just curious as to where this number came from...

For myself real world experience. The 2 greatest causes of trailer sway are speed and how the trailer's weight is loaded. Plenty of other things too but those are major players. I don't get more than a "hey a trucks passing" seat of the pants feeling at 65. At 70 when they pass it's whoa....pay attention we're moving side to side.

[TitanMike]

Originally Posted by babock

62-65 MPH with my adaptive cruise control on. Makes the trip a lot less stressful.

Nice thing about being retired, it doesn't matter if I get there 15 minutes earlier.

If you actually do arrive earlier. When traffic gets heavier and slows all us "slow pokes" usually catch up.

Can't count the number of times I end up at gas pumps, in rest areas, or checking into an RV park at the same time as someone that has passed me at a higher rate of speed back on the highway.

What was that old story about the turtle and rabbit racing?

FWIW, taken alone the difference in fuel mileage between 8 and 10 mpg may seem insignificant but in reality it's a 25% increase.

Of course mileage will vary but a hard fact remains. It takes horsepower to pull (or push) a big body rv through the air and intakes more fuel to generate that HP.

[TitanMike]

Originally Posted by Justice12t

Silly question...???

Where did this magical 65mph limit come from? Like really come from not just opinion? Taking MPG's out of the conversation...

Is it because of what the side wall of the china bombs say from factory? Or something else?

Because like so many others, my tires are rated above 65mph, actually 81 I think. I'd never go that fast, I am just curious as to where this number came from...

The magic number came from actual testing by the manufacturer and I'd based on heat generated in the tire at a given speed under rated load.

[jcr59]

Originally Posted by GrayghostUSA

65 mph, 1500 rpm, 12 mpg

Ditto!

[NJKris]

Originally Posted by Mike134

For myself real world experience. The 2 greatest causes of trailer sway are speed and how the trailer's weight is loaded. Plenty of other things too but those are major players. I don't get more than a "hey a trucks passing" seat of the pants feeling at 65. At 70 when they pass it's whoa....pay attention we're moving side to side.

I do find any 'buffeting' from passing rigs is due to relative speeds. And this is why I like to hover just below 70, conditions permitting. Most tractor trailers passing me are only going slightly faster than I am, and I notice no buffeting as they pass. If I were going closer to 55, their 15 mph relative difference is felt as they pass. While it's important to know your limitations based on your setup/rubber, it's equally important to try to keep up with the flow of traffic, for safety reasons. If conditions are like OP described, light traffic, I will ease off throttle for sake of efficiency.

Getting 11-12 mpg towing (normally 18 mpg not towing, not highway driving) Closer to 12 when I keep it in the 60s.

[srosey]

62-64 with the cruise on all day long. I let the speed build a bit coming down mountains, but that is about the only time i go over 65. I pull my rig up the mountains the same speed I run on the flats. With the dually I hardly feel a semi passing no matter the speed difference. I may arrive an hour later after a full days drive, but I'm more relaxed and less tired just sitting back and watching everyone else jockeying for 1 car length faster while hitting the brakes every other minute.

[Mtelkman]

62-65 towing seems to be the sweet spot for fuel mileage on my truck.

[cavie]

Originally Posted by Mike134

When on an Interstate with posted limits of 70-75 MPH what is your typical cruising speed with light traffic, clear & dry with miles and miles of straight road ahead?
Myself I like 64-65 mph.

10 over on the interstate, 5 over in town.

[boondocking]

Originally Posted by Jim34RL

If it is a Ford 6.0L and a 6.4L engine it is never built proof, it is a Ford by the way. You know what they say don't you, 90% of the Fords built are still on the road today, the other 10% did make it home.

Bet you don't know the real saying.

Save Money, Buy a Dodge, They Only Run Half The Time

[Mike134]

Originally Posted by boondocking

Bet you don't know the real saying.

Save Money, Buy a Dodge, They Only Run Half The Time

There are two Ford sayings...........always seemed to be fixing or repairing my '68 Torino daily,
but it was never found on the road dead