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 > Driving 10km slower for gas mileage

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Grit dog

Black Diamond, WA

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Posted: 07/11/18 05:06pm Link  |  Quote  |  Print  |  Notify Moderator

12thgenusa wrote:

No to nitpick but that’s only a little over $4 US.

Yep, correct. And Western WA here is trying to beee like BCee with our fuel prices.
My take on the fuel savings is what's your time worth? And this goes both ways. If drivign slower only costs you 20min and saves you enough to buy a cold 12pack (6pack in BC $)maybe it's worth it.
But if when I drive X country, if I average 70mph on I 90 (easy to do by yourself without much stopping) I can save 10-11 hours of driving over averaging 50mph. When it's the difference between a 2 day or 3 day drive....pour the fuel to 'er and get the F out of my way!


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romore

Okanagan valley British Columbia

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Posted: 07/11/18 05:20pm Link  |  Quote  |  Print  |  Notify Moderator

The difference in miledge between 90 and 100 is so insignificant it's not worth worrying about. I do notice increased fuel consumption if I push much beyond 100 towing but I am not comfortable going that fast and never in that big of a hurry. I am content to stay in the right lane and let the leadfoots go by.

BarneyS

S.E. Lower Michigan

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Posted: 07/11/18 05:39pm Link  |  Quote  |  Print  |  Notify Moderator

Please keep the politics out of this thread. Thank you.
Barney

bartlettj

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Posted: 07/11/18 08:07pm Link  |  Quote  |  Print  |  Notify Moderator

I'm towing my TT in BC this week. I'm seeing $1.46/l for unleaded all over Vancouver Island and up at Squamish. I was happy to find diesel for $1.35 today. I was paying $3.08 for Diesel when I left Oregon. I find I don't see a hit until I go over 110km/h. I usually find a nice semi to draft if I need an economy boost.

Bobbo

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Posted: 07/11/18 08:14pm Link  |  Quote  |  Print  |  Notify Moderator

I haven't had my TT long enough to get numbers, but here are the numbers I had with the Class C that I owned for 10 years.

60 mph - 9 mpg (97 kph - 4 kpl)
70 mph - 6 mpg (113 kph - 3 kpl)

That is a 17% speed increase and a 33% fuel efficiency decrease. (Metric figures rounded off.)

Speed matters.


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ktmrfs

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Posted: 07/11/18 10:23pm Link  |  Quote  |  Print  |  Notify Moderator

it may depend on your truck gearing. On my 2015.5 duramax, towing at 55 I will be in 5th gear for sure in tow/haul mode and likely even if not. At 60mph I'm in 6th when out of tow haul, 62 goes to 6th in tow haul. that extra gear pretty much evens out fuel mileage. Since wind resistance, engine rpm, and tire rotational losses are all square law function vs speed, they will eventually dominate over linear losses, rolling resistance etc. But my experience is that those "square law" losses are balanced by the linear losses up to the 50ish mph range. by the mid to upper 60's they really dominate. But in the 50-low 60 mph range not as dramatic effect on mileage.

you can try but may find the difference in mileage not noticeable enough to be worth the effort.


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1320Fastback

Vista, Ca

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Posted: 07/11/18 11:53pm Link  |  Quote  |  Print  |  Notify Moderator

It takes 4X the horsepower to double your speed, mostly all is due to wind resistance.

Drive as fast as you can afford

Personally because it's California law and I live here I tend to drive 55-62mph everywhere I go.


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valhalla360

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Posted: 07/12/18 05:58am Link  |  Quote  |  Print  |  Notify Moderator

Don't do 80 in a 100 zone unless conditions really call for it (ie: don't run off a curve because you tried to take it at unsafe speeds). If you can safely do the speed limit, stay fairly close to it. At 80, you are a danger on the road worse than someone doing 130. It's particularly bad on 2lane/2way roads where drivers get frustrated stuck behind a slow poke and take risks to get by you.

Generally, you aren't going to see much difference between 90 and 100 but it depends on the drivetrain. Especially with older trucks with fewer gears somewhere around 80-90 you will find a bad spot where the transmission gearing is either too high or too low (It will vary based on engine, transmission and loading), so the engine races under light load or it lugs under heavy load. In that case, it may be more efficient to pick up the pace by 5-10, so the drivetrain is in a more efficient gearing.


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Lynnmor

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Posted: 07/12/18 06:12am Link  |  Quote  |  Print  |  Notify Moderator

Fuel mileage drops considerably with speed when towing. Don't worry about those that want to speed, you will never find a speed that will suit those that always want to go like crazy.





IB853347201

Eastern Ontario

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Posted: 07/12/18 08:18am Link  |  Quote  |  Print  |  Notify Moderator

SoundGuy wrote:

Pipe dream. [emoticon] Here in the GTA regular is running $1.30 to $1.38 per litre (has nothing to do with a litter [emoticon] ) depending on the time of day, any reduction Ford invents will quickly be corrected by fuel suppliers taking an even bigger chunk and in the longer term the price at the pump will still be uncomfortably high. [emoticon]


That's why I moved out of the GTA. Much like Vancouver prices, Toronto GTA prices are a complete rip off.

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