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Who 01-21-2008 12:46 AM

ScanGauge WindGauge
As a long distance cyclist, I never tended to give the wind much thought once strapped back into the rolling cocoon. On a motorcycle I rarely thought about it except on 2 lanes roads with crosswinds coming from the left so that truck wakes would never surprise or a time in South Dakota were able to converse quite well at over 70 mph (and that huge tailwind was attached to a major storm).

Today I was coming back to Toronto from the east and I couldn't crack an average of 10 LHK (23½ measly MPG) where I'd usually be 8.5 to 9 and most of you would be under 5. I was averaging 90 KPH / 56 MPH, keeping LOD moderated over all the rises, but my mileage was 10.1 LHK and it was also pretty cold - the IAT was -4C/24.8°F, coldest I've been out with a ScanGauge. Anyway, I was starting to wonder just how much the denser air affects my un-aero blob but looking at the weather logs in that area, there was a WNW wind of 22-32 KPH / 15-20 MPH so there was the missing 3 or 4 extra easy highway miles per gallon I was expecting.

A load type gauge should really be standard in every vehicle. On my bicycle it's pretty obvious, in a car it isn't, but with it, you really become aware of which roads aren't as flat as they appear, the impact of accessories, and even the wind, although it'd be nice to have a pitot tube like on a plane - so that it doesn't make you start to wonder at what temperature the air gets so thick that mileage plummets!

I want a NAV to help assess grade info but none of the main ones like the TomTom seem to have any altitude or grade info.

Excuse the ramble... :turtle:

MetroMPG 04-02-2008 10:08 PM

Actually, Dan (krousdb) had pitot tube installed in at least one of his cars (probably 2). And I know he wasn't the only one.

Who 04-02-2008 10:13 PM

A pitot tube would cause far too much drag for such a small svelte smooth vehicle as mine. :p

MetroMPG 04-02-2008 10:16 PM

Princess and the pea?

diesel_john 04-03-2008 12:30 AM

looking at vacuum, you get a feel for changes need a big dial though. the diesel is tough to drive, my fuel pedal is constantly changing all day long, no vac., no cruise, no nothing. now even no smoke, with the bio-diesel.

RH77 04-03-2008 01:38 AM


Originally Posted by Who (Post 17574)
A pitot tube would cause far too much drag for such a small svelte smooth vehicle as mine. :p

Puh-lease. Knowledge is power, so apply it to the vehicle and P&G :p

Truly, vehicle speed versus headwinds can mean the difference between a Dodge Avenger getting 29.4 MPG and the identical twin (Sebring), getting nearly 38. It's all wind dude.

RH77 "Headwind77"

s2man 04-03-2008 05:38 AM

My browser's home page is three weather sites, but I never paid much attention to the wind vs my mileage. When I put on my permanent grill block I had super FE on my morning commute. Woohoo, it worked. Then I realized I had a tail wind on the way to work. LOL. I"ve paid closer attention to wind since then. I now vary my route, or aggressively seek out a truck to draft, if winds are contrary.

tasdrouille 04-03-2008 08:21 AM

Just watch the LOD on the SG. Your "usual" 8.5-9 LHK corresponds to a specific LOD in 5th speed. If you want to compensate for the denser air or wind to keep roughly the same mileage as usual you just have to slow down till your LOD matches what you usually get and voila.

Who 04-03-2008 09:23 AM

RH77, I drive an aerodynamic disaster...

RH77 04-03-2008 01:45 PM


Originally Posted by Who (Post 17650)
RH77, I drive an aerodynamic disaster...

I know, I'm just being a pain :o

Mainly, my point is the ability to know your headwinds, to slow to a target "Indicated Airspeed", which could outweigh the small tube's drag (or even make subtle, inconspicuous aero mods to outweigh it).

For example, your target aero combined speed is 120 kph. If the headwinds are 20 kph, you know to slow to 100 to hit your target -- or at least slow a bit.

It's just another feedback device.


MetroMPG 04-03-2008 01:54 PM


Originally Posted by tasdrouille (Post 17643)
Just watch the LOD on the SG.

Why not just monitor instant MPG? Since it's a function of load, and it's a metric that is immediately understood by everyone else when discussed. And since, ultimately, that's what you're concerned with.

Who 04-03-2008 01:57 PM

I think that was the point of my post. The LOD and instantaneous mileage on the ScanGauge seems to give good feedback as to whether or not the wind is favorable and to what degree. The joys of driving a barn door.

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