My Car in Unfair Tax Bracket

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10 Apr 2008, 11:27 am

They was advertising a small Suzuki Hatchback 1.0 in newspaper that does up to 55mpg, 65 bhp and CO2 emission below 119g so they only pay £35 pounds tax a year. However I own a Citroen ZX 1.9D 70bhp, 60mpg and yet pay £190 tax a year. I know that my car is a diesel and diesels have to pay more tax but this is ridicule. My car is even bigger so it is more practical then the Fiesta size Suzuki. If I could find out the CO2 emissions but I cannot find on the Internet.

iamnotaparakeet
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10 Apr 2008, 11:58 am

Quote:

Chemical composition

Petroleum-derived diesel is composed of about 75% saturated hydrocarbons (primarily paraffins including n, iso, and cycloparaffins), and 25% aromatic hydrocarbons (including naphthalenes and alkylbenzenes).[9] The average chemical formula for common diesel fuel is C12H23, ranging from approx. C10H20 to C15H28

http://en.wikipedia.org/wiki/Diesel#Che ... omposition

Gasoline, or petrol, is made of a mixture of hydrocarbons, which are molecules composed of carbon and hydrogen atoms. Typically, in standard gasoline, the hydrocarbons consist of carbons chains are 5-10 carbon atoms long.

The exact mixture of which types of hydrocarbons depends entirely on the specific sample of gasoline (what type of oil it was made from, which company refined it, what additives were added, etc.)

http://wiki.answers.com/Q/What_is_the_c ... f_gasoline

For alkanes the formula is CnH2n+2 and for cycloalkanes it is CnH2n

For gasoline of decane C10H22 the equation would be:

(2)C10H22 + (62)O2 -> (20)CO2 + (22)H2O

For one molecule of C10H22 you get 10 molecules of CO2

For common diesel (C12H23) the equation is:

(4)C12H23 + (71)O2 -> (48)CO2 + (46)H2O

For one molecule of C12H23 you get 12 molecules of CO2.

Of course there's C10H20 diesel, but I picked the above because it is "common".

Because there are more bonds in diesel you get more energy per mole. I don't know all the details, but I hope this helps.

Aspie_Chav
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10 Apr 2008, 12:04 pm

Thanks Einstein I am sure this information will come in useful when I become a Rocket Surgeon.

viska
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10 Apr 2008, 12:41 pm

Aspie_Chav wrote:

Thanks Einstein I am sure this information will come in useful when I become a Rocket Surgeon.

It doesn't take a PHD interpret "Because there are more bonds in diesel you get more energy per mole." While your miles per gallon may be better, a gallon of diesel contains more energy than a gallon of unleaded. So a gallon of diesel will generate more harmful emissions than a gallon of unleaded.

iamnotaparakeet
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10 Apr 2008, 2:00 pm

That would also depend on the density/concentration of diesel compared to gasoline. An item I don't know.

iamnotaparakeet
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10 Apr 2008, 2:13 pm

Okay, the energy concentration of gasoline is 34.8 megajoule/liter and the energy concentration of diesel is 38.6 megajoule/liter. So diesel has 3.8 MJ/L more than gasoline or 10.9% more energy per volume than gasoline. Not a whole lot more though.

http://en.wikipedia.org/wiki/Gasoline#Energy_content

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11 Apr 2008, 3:01 am

My car does 60mpg while your average petrol car of similar horse power does 40, thats more the 10%. One big thig I notice about the engine is that it runs completely cold to touch. On my escort the engine runs very hot it burned some of my electrical wires

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