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Through experience and many questions to professors, mostly mechanical engineering professors.
I have come up with, it does vary a suprising amount. Brake specific Fuel Consumption, or BSFC, is usually where the engine is the most efficient and generally where the engine uses the fuel to it's best extent.
There are many variables,
These may help.
tire size (this doesn't mean go and bolt up big 'rap-star' wheels, a civic will lose efficiency, and often times acceleration. just doesnt have the power.)
Low restriction exhausts (an engine in most cases will need some back pressure in your exhaust to work properly)
Low restriction intakes (smoothing out the air flow in to the engine with a good air filter, if the filter is dirty your efficiency can drop like a brick.)
A manual transmission atleast usually, loses less of the power to the wheels. (some new variable transmissions are suprisingly effective)
Wieght, not only extra junk in the trunk, or on your gut. 100lbs = 1% less fuelefficient and it adds up.
moving weight, wheels? rotating mass takes some effort on the engine's part to roll. pistons, connecting rods, and crankshaft? they all absorb engine power. (you can only lighten these so much before failure under normal conditions)
Fuel type, Diesel has more energy than petrol. for the same work diesels will use less fuel in most situations. Petrol, gasoline, at the pump do you buy the cheapest? the most expensive? you need to know what your car takes for it to run it's best, 85.5 will make a corvette less powerful and less efficient, the corvette's high pressure engine needs a fuel that can take that pressure with out detonating. however a old Honda civic wont run very well on 93, that lower pressured engine won't burn that fuel to it's full potential, causing you to burn more fuel to do the same work.
smooth low slung cars with very little frontal area, the bit of real estate of the car that is exposed when you look dead on at it, and a smooth rounded tail end, many times diffused and smoothed air flow underneath the vehicle will help a great deal, take a look under the prius sometime.
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What brand of car is the most economic?
In my opinion, Toyota offers the best overall value. In the production line, of course manufacturers will offer the best ones that would give you more mileage. But, after buying a vehicle, its brand wont really matter for the mileage it could give you. Size of the cars can also vary its being economic. Well, of course, you just have to find some difference with the space and safety test grade. Cars that are properly maintained and serviced can give you more mileage along with some extra driving tips. Proper driving can also give you more mileage in a way that you run your car at the way that it is not overdone. Too much weight, to much rpm, old oil, improper tire pressure can give you a decrease for a mileage. But for now, small cars branded with Smart or Toyota can give you good mileage.
How much would one dollar in 1931 be worth today?
If you mean $1.50, it was worth $1.50 in the 1930s.If you mean how much it would be worth today allowing for inflation, that's a much more difficult question. The CPI has gone up at least 20- or 30-fold since then but it's very hard to compare prices since so much has changed. For example, some foods that were once comparatively cheap are now expensive, and vice versa. One measure would be that it bought about 7 or 8 gallons of gasoline, which would cost around $20 today. It would have paid for 30 bus rides in most cities, versus one today. At the post office it would have let you mail 50 letters, which would cost $20 today.On the other hand you have to compare quality and technology, too. $1.50 would have purchased 3 or 4 78-rpm records each holding 2 songs, so you could try to match that to the cost of say 15 or 20 songs on a CD or 6 iTunes downloads. However, the 78s would last through about a hundred playings before wearing out, they broke really easily, couldn't be copied or put on a portable player, were mono and had a frequency response from around 100 to 6000 Hz, so the quality difference is far greater than the price difference.CommentPostal rates and gasoline prices are two commonly cited examples of inflation, but their price behavior is so badly skewed by non-market influences that they should probably be excluded from any inflation analysis, IMHO. For instance, a first-class postage stamp in 1863 cost $.03. The same stamp in 1958 cost $.03. Today, the first-class stamp costs forty-some cents, but it's a number that inflates so often that no one can keep up with it, and even the US Postal Service has begun to issue "Forever" stamps, bought at a current rate, but honored through subsequent rate hikes. One might speculate that issuing "Forever" stamps is more cost-effective than printing and handling billions of one-cent "add-on" stamps. But it's hard to ignore the fact that the US Postal Service is so addicted to rate hikes that it has memorialized them in the form of "Forever" stamps.As for gasoline, the market changed completely with the rise of OPEC. Until then, gas could be had at the pump in the US for a quarter a gallon. After, it's been a wild ride.The main point is this: non-market influences have governed the rises and falls of these two prices, and many others.In the case of the postage stamp, market influences don't even enter the arena. The US Postal Service is a branch of the US federal government, and thus is not examined for profitability. Like all government enterprises, it is expected to lose money, and does so with alacrity and dependability.In the case of oil/gas prices, they have been artificially manipulated since the early 1970s, when the Middle Eastern oil-producing nations figured out that they had a virtual stranglehold on the rest of the world, and could charge practically any price they wanted for their oil. A barrel of crude that sold for pennies in 1965 now sells for $90.
Why would a little green triangle light come on on the RPM gage on a 1992 Dodge Dakota 3.9L?
if it has a manual transmission it would be the upshift indicator. it will come on to tell you the optimum shift point for fuel economy as you are driving.
What is best RPM to operate 60 series Detroit diesel?
The optimum range on that engine is 1100 to 1500 rpm, depending on how it's geared.
What RPM for best economy from series 60 Detroit diesel?
1400 RPM after you have gone through the gears and at road speed.
Is fuel consumption high in Low gears or in high top gears?
generally speaking, fuel consumption is higher in low gears because the rpm of the engine is higher. Performance is measured in kilometers/gallon. You have to consider that cars are designed for optimum performance when you drive at around 80 km/hr. For each car there is an optimum ratio distance/fuel consumption.
What gear should you drive your Lincoln ls 2001 around in d5 or d4?
d5 for lower rpm's, better fuel economy
What should the RPM read when going 65mph on a 1993 1.6 Geo storm?
Depends on what size tires you are using. Different size tires will change the reading. The rpm with 55's will be different than with 75's. It's a trick that Detroit used to comply with new fuel economy standards. Increase the size of the tire and you increase fuel economy.
What does green shift light mean on corsa?
The green Shift arow apears at 2000 RPM and it means that you should and can shift up to keep a low fuel consumption. You don't have to is just for fuel economy.
Do 22 inch wheels affect the performance and fuel economy on a 07 charger?
The size of the wheel itself does not affect performance or fuel economy, but the height of the tire does. A taller tire will decrease performance, but increase fuel economy. A taller tire would have a larger circumference, and therefore decrease the engine speed (RPM's) leading to the improved economy. On the other hand, a taller tire also acts to reduce the car's ability to accelerate (like changing the gear ratio). Also, the speedometer won't be accurate any more.
What is causing your 1999 jeep wrangler while its in the last highest gear the arrow on dash flashes to go up another gear and there are no other gears?
The light is triggered by rpm for the best fuel economy, I would think that it is supposed to skip that on 5th gear, but I never tested it out myself.
What are the symptoms of bad or worn overdrive on a 2000 Chevrolet Silverado 4l60e transmission?
The vehicle will have a higher rpm at highway speeds, lowering fuel economy. The vehicle could shudder, or jump in and out of overdrive.
How do you calulate your energy savings if you reduce the amount of rpm from a 3450 rpm to 2350 rpm?
You can calculate the cost of your energy savings when you reduce the rpm's from 3450 to 2350, by dividing 3450 into the cost of fuel. This will give you a fuel costs per rpm. Take the cost per rpm and multiply it by 2350. Subtract this number from your original cost and you will have your energy savings.
What is overdrive on an automatic 2 wheel drive 1988 ford ranger supposed to be used for fuel efficency or pushing transmission into a lower gear?
overdrive allows the engine to run at lower RPM's , which increases the fuel economy and also the transmission runs cooler
