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gayanath

Fuel Efficiency with Weather (Humidity and Air Density)

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Let's assume you are travelling from Paliyagoda to Hambanthota via Katunayaka, Outer circular and Southern Expressways. You will be travelling on 100 km/h. 

Case 1: Departing at 06:00 am in the morning

Case 2: Departing at 12:00 noon

Case 3: Departing at 6:00 pm in the evening

In which case you will get the highest fuel economy and the lowest fuel fuel economy ?

Concern factors: Humidity and Air density. (Let's assume wind direction, wind condition and road traffic condition is same for all the three cases)

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Posted (edited)
39 minutes ago, gayanath said:

Let's assume you are travelling from Paliyagoda to Hambanthota via Katunayaka, Outer circular and Southern Expressways. You will be travelling on 100 km/h. 

Case 1: Departing at 06:00 am in the morning

Case 2: Departing at 12:00 noon

Case 3: Departing at 6:00 pm in the evening

In which case you will get the highest fuel economy and the lowest fuel fuel economy ?

Concern factors: Humidity and Air density. (Let's assume wind direction, wind condition and road traffic condition is same for all the three cases)

I would assume that departing at 6pm would give the best fuel efficency (due to cooler, denser air that would stay consistantly cooler thoughout the night vs the other times ) but really it will be a negligible change. Just leave when its most conveinient...

Edited by Kavvz

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Posted (edited)

Sudeva mata wathura tikak denda Sudeva.

Real Petrol Head:

EeghGruVAAAiDIV.jpg

Edited by fiat fan
  • Haha 6

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1 hour ago, gayanath said:

Concern factors: Humidity and Air density. (Let's assume wind direction, wind condition and road traffic condition is same for all the three cases)

Can't assume these factors as they are never be same during those time.:action-smiley-060:

Don't try to save the fuel, rather save the time :banana_hitit:

 

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6 hours ago, gayanath said:

Concern factors: Humidity and Air density. (Let's assume wind direction, wind condition and road traffic condition is same for all the three cases)

What about the weight of the passengers? It varies a lot if their bowels have been cleaned before the trip or not, at least 10kg/person I assume 💩💩

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5 hours ago, gNaveendra said:

Don't try to save the fuel, rather save the time :banana_hitit:

 

Including the time wasted in trying to figure this out :)

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I'm guessing 6AM, apart from the factors @Kavvz mentioned the AC would be working under minimum load due to high humidity in cooler environment

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Posted (edited)

Of course this is purely a technical question and the answer will not use to save fuel. I have linked this to the practical situation to get a better understanding and same time proposed few assumptions as the matter is complicated by more variables.

The main reason for the question was the "Auto Vision" program yesterday, that said fuel efficiency is declining in the evening due to high humidity. 😭🤑🤑

 

Edited by gayanath

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11 hours ago, gayanath said:

Let's assume you are travelling from Paliyagoda to Hambanthota via Katunayaka, Outer circular and Southern Expressways. You will be travelling on 100 km/h. 

Case 1: Departing at 06:00 am in the morning

Case 2: Departing at 12:00 noon

Case 3: Departing at 6:00 pm in the evening

In which case you will get the highest fuel economy and the lowest fuel fuel economy ?

Concern factors: Humidity and Air density. (Let's assume wind direction, wind condition and road traffic condition is same for all the three cases)

I'd have taken a guess and gone with 6 AM - anyways too many variables to accurately decide...BTW i saw this posted today in a Facebook group too - guess it was you :D 

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10 minutes ago, matroska said:

BTW i saw this posted today in a Facebook group too - guess it was you :D 

😃🙃😉 !!

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3 hours ago, gayanath said:

 

The main reason for the question was the "Auto Vision" program yesterday, that said fuel efficiency is declining in the evening due to high humidity. 😭🤑🤑

 

Do you still watch that stupid programme?  Even though don't take what they say seriously . 

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1 hour ago, gayanath said:

The main reason for the question was the "Auto Vision" program yesterday, that said fuel efficiency was declining in the evening due to high humidity. 😭🤑🤑

That's not true at all. Humidity is highly subject to the day's weather. So you can't say that humidity is always high in the evening. You can go to AccuWeather or some weather data website and observe hourly stats to easily disprove this statement. 

However, humidity does affect performance. Engines like cool dense air, so higher humidity reduces performance since water molecules in the air displaces Oxygen making it less "dense" for combustion.

Combining both above points, this means that we can't surely say that you will get better or worse fuel economy depending on the time of day. If we assume humidity is exactly the same throughout the day, moderately cooler temperatures would give better results. 

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2 hours ago, Davy said:

Oxygen making it less "dense" for combustion.

a little OT but this just reminded me of the TG Bolivia episode :D 

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