Hot answers tagged fuel-consumption
9
Holding the clutch in is generally not a good idea. The clutch is designed to be used for very short periods between gears, and for holding in first when you are about to pull away. So if you are wanting to coast you should definitely do it in neutral. The difference between these two from a fuel consumption perspective should be marginal.
From a safety ...
7
The root problem here is that you are conflating several different terms. See Wikipedia for a calculation of horsepower from torque (tau) and rpm (f in this equation):
If you assumed a flat torque curve, you can see that peak horsepower would continue to increase with RPM. In fact, if you wanted to increase your marketing horsepower for a new vehicle, ...
4
It is possible that you have a brake or brakes that are dragging. After a 15 or 20 minute drive stop the car and check for a sticking caliper. Feel each wheel in the area of the lug nuts to see if one feels much warmer than the others. They should all feel warm but about the same temp when comparing both backs and both fronts.
4
Your question has a few unconnected points in it:
as jmosrt253 said, a Humvee engine is a large diesel engine - which means its torque is low down in the revs range
Humvee engines, like many large diesels, are not highly tuned. They are built to be robust and survive in extreme conditions
up to a point, horsepower is irrelevant for speeds. It is relevant ...
3
The engine type can definitely affect the price of a service job. Something like a timing belt service can be simple on one engine type and horrendous on another, due to things like accessibility of the components. A water pump could be directly accessible on one engine type, but require removal of the whole front bumper for access on another.
2
The odometer reading is one of the key factors for pricing of a used car. The combination of mileage, age and physical condition of the car are enough to vary the price anywhere down to a tiny fraction of the list price.
The engine size, while important, it's more like the difference an alternative model may have. One engine size might be known as the best ...
2
Assuming this isn't a daily driver, make sure it is legal locally to burn and start with small doses (2% mix) then add a little more every fill until it doesn't run properly. Then come back and tell us how it went! :) Also, this may foul plugs, ruin O2 sensors and lead to high carbon build-up, but all in the name of progress right?
2
As you said the crux of the issue has to do with getting every last amount of energy out of a unit of fuel. You can consider this your total fuel efficiency.
Accelerating your vehicle from rest to 60mph or 100km/h will require a fixed amount of energy based on the weight of the vehicle. (excluding wind, friction and rolling resistance).
So you need to ...
2
Does accelerating faster worsen fuel efficiency?
Yes.
Now obviously when you accelerate harder, more fuel is being pumped
into your engine, but you'll sooner get to that cruising sweet spot
where fuel consumption is a lot less. So is the payoff worth it or
not?
No.
This is easily measured via the OBD II port. For example, my Accessport ...
1
It takes a specific amount of energy to accelerate a specific amount of mass to a specific speed. So just looking at those factors, you'd be right to assume that it matters little how quickly you accelerate said mass.
But that's not how the real world works. The problem here is that combustion engines and the many things we connect them to are astoundingly ...
1
Why have extra engine power? Well if 35HP is required to do 50 MPH and that's all you have, it will take a very long time to accelerate to that point - possibly several minutes.
Also, people like the extra power for the sportiness of the car - quick acceleration when you want it, and not having to press the throttle down much to go up hills etc. You'll ...
1
There are many factors which could influence your fuel consumption, namely, the design of the car itself - not much you can do about it. Are you getting what the EPA label said you would be getting?
Also, here are some things that will improve your fuel economy:
Use full synthetic oil and change at regular 5k mile intervals
Maintain correct tire pressure ...
1
You need to understand that both consume the minimum amount of gas, but also, if you going downhill in 6th gear, and you have a injection fuel engine, this has exactly the same effect, and the injectors cut all the gas to the cylinders.
Only carburator engines spend gas if you're shifting gear and not accelarate.
For a safety point, never use neutral, ...
1
If I remember correctly you can't generally blend plant-based oils with petrol (gasoline for our US readers) and expect them to burn in the same way, although you can do so with Diesel. This is because petrol is a much lighter oil than Diesel, wheras plant oils, while lighter, are much closer to Diesel.
Ethanol is lighter still ( in fact, after methanol, is ...
1
If you are mixing other fuel , you need make changes in compression ratio and that will depends on the type and amount of the mixed fuel. Other wise your new fuel mixture will not be explode properly then it will emit more carbon and smoke.This will make two problems
More polution- this may illeagl
Ruin engine life- More carbon will cause more friction for ...
1
I can think of a couple reasons (mostly apply to automatics though)...
If you go WOT to maintain speed, there's nothing left for passing/going uphill/to tell an auto to downshift. Also, the car would be in open loop mode and waste fuel.
To keep the car in closed loop, you're going to max out at around 75% throttle. Any time you did pass or have to climb ...
1
Some solutions have been implemented - input airflow is reduced in many engines (especially turbo versions) so you aren't actually having to send a lot of air through the engine.
In any case the 'suck' when the throttle is only slightly open is minimal, so you aren't losing a lot of energy with this.
You would waste more energy having to use a wide open ...
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