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Questions tagged [fuel-efficiency]

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6
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2answers
167 views

Is flying more sustainable than taking the train?

This paper argues that flying and taking the train compares in terms of energy - can this really be true? I am thinking that energy is a reasonable measure of sustainability although comparing ...
5
votes
1answer
100 views

Carbon footprint of CNG vs. Diesel as a vehicle fuel

What is the benefit, in terms of carbon footprint, of replacing a diesel fueled vehicle with an identical one with a CNG engine? I'm not convinced I can simply take the carbon intensities of these ...
6
votes
2answers
178 views

Water heater vs stovetop: most efficient way to heat water using natural gas?

When I am going to boil a pot of water for cooking, will the total energy consumption be less if I start with hot water from the tap? A few considerations: Both the water heater and the stove burn ...
8
votes
1answer
145 views

Does putting an automatic car in neutral when stopped help save petrol?

In Australia, most cars are automatic, and most people stay on "drive" while braking when stopped at a red light (i.e. if they weren't breaking, the car would drive forward). I was wondering if ...
8
votes
2answers
127 views

How to choose a more sustainable vacation option?

Background In general, for a given transportation medium, modes of transport that are more densely populated are more efficient than those that are more sparsely populated. For example, it is not a ...
4
votes
2answers
143 views

Size of wood lot required for cooking/heating (US west coast)?

On the west coast of the US (WA, OR) how many acres of trees would be required to keep a single family home supplied endlessly? If I and my family plant a tree for everyone tree we cut for fuel, how ...
6
votes
1answer
73 views

Is it possible to calculate energy efficiency of a flat by knowing how much energy was consumed for heating?

During 6 days my heating system consumed 11,4 m3 of natural gas keeping its temperature at 20 degrees of Celsius. No human or other energy source (except for refrigerator) was inside the flat at that ...
4
votes
2answers
112 views

How efficient are tiny cars compared to others?

I may be purchasing a new vehicle soon (still doing the whole cost-reward calculations). When looking for a new vehicle fuel efficiency was important to me, both for savings considering how much I ...
1
vote
3answers
86 views

Fuel efficiency when decelerating on a hill

Another efficiency question from me out of curiosity. Let's say that I am driving at a decent efficiency rate (say 40 MPG) and am coming up on a hill, with no cars immediately behind me or traffic ...
7
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2answers
3k views

Impact on environment: a million horses vs a million cars

Would commuting on a horse be more eco-friendly? What if there were millions of people did that? Would millions of horses be better than millions of cars?
2
votes
1answer
117 views

Are we running out of fuel?

It's just a matter of time, Peak-Oil will happen. There is no logical argument to assume it will not. We are doing efforts to replace petrol based products with something else, for fuel in combustion ...
6
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3answers
1k views

Oxyhydrogen as home heating method

I'm curious about the efficiency of using Oxyhydrogen as a home heating method. Oxyhydrogen can be generated from water. I understand the fact that it takes more energy to generate the oxyhydrogen, ...
5
votes
3answers
5k views

Can alloy wheels (for a car) pay for themselves through fuel savings?

Magnesium alloy wheels (aka mag wheels) are desirable to car enthusiasts due to an increase in performance, but with reduced weight there would also be a fuel saving. Obviously prices and fuel ...
6
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2answers
140 views

Burning wood efficiently via rocket stove

Is burning wood considered sustainable if the efficiency can be improved up to 90% compared to the 50% of conventional burning stoves?
8
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1answer
139 views

What would be the most sustainable biomass source for (100%) ethanol production?

So I have read that sugar (cane) is way more efficient than corn, (and that Brazil leads the way in taking initiative to actually bother with this advance in biofuels sustainability), and that, based ...
10
votes
1answer
1k views

What is the most environmentally-friendly fuel source (e.g. wood, coal, oils, alcohols) for campfire cooking?

When factors like emissions, renewability, and heat / energy efficiency are all taken into account, what would be the very best fuel source(s) to use for camping cooking, with sustainability and ...
7
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2answers
3k views

Is it better to use propane or natural gas as a heating fuel?

Given the choice to adjust a new furnace to either propane or natural gas (?), is one less unsustainable than the other?
16
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2answers
4k views

When does using a car's start-stop system become more economical?

In this question it was asked how economic it is to turn your car's engine off when waiting for a traffic light. In the accepted answer it is said that it becomes more economical to turn it off if you ...
7
votes
2answers
5k views

Can chip tuning make a car more fuel-effective?

I'm considering to have my car engine chip tuned. I'd like to increase the fuel efficiency of the engine. Increasing the power of the engine would be only a secondary advantage of doing so. Most of ...
4
votes
1answer
252 views

Efficiency of car-sized vehicles running on train tracks

New Zealand doesn't have particularly advanced technology for its railroads, but I have seen pickup trucks that have wheels that can run on railroad tracks as well as a separate set of wheels with ...
3
votes
1answer
80 views

What is the fuel-use of an industrial sized diesel-machinery-based composting business?

As I understand it, the bulk compost made by one of our local businesses is produced by using heavy machinery to regularly scoop up and turn the source material and keep it active. How much fossil ...
37
votes
8answers
26k views

How effective is turning a car's engine off while standing at a traffic light?

I know some countries enforce having cars automatically shut down the engine when stopping at a traffic light. How much resources are really saved by this process? Does the car need to be ...
33
votes
3answers
3k views

Are electric cars as environmentally friendly as we think they are?

Given the fact that the average lifetime for a car battery is 3 years and all of the batteries end up at a landfill at the end of their lifetime, how sustainable are electric cars in providing a ...
15
votes
2answers
3k views

Propane vs. Electric vs. Heat Pump

Is there a relatively reliable way to figure out what energy source to go with when upgrading appliances? We need a new hot water heater, for starters. Our current one is propane. Options include ...
8
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2answers
2k views

Is my car more sustainable with or without an EGR?

I drive a 2003 Volkswagen Jetta with a 1.9 liter turbo-diesel engine. I often get well over 50mpg on the high way, and I love the fact that I have such a fuel-efficient car that is also fun to drive. ...