[DMCForum] Re: DeLorean MPG (Martin G)

["content22207" <brobertson@xxxxxxxxxxxx>]

OK -- *THIS* is scary. Can I borrow Greg's Hell Thermometer...

Bill Robertson
#5939

>--- In DMCForum@xxxxxxxxxxxxxxx, Martin Gutkowski <martin@xxxx> wrote:
> Now you guys know that Bill and I often don't see eye-to-eye, and on 
> readig this e-mail, I jumped in and calculated my own MPG based on a 
> surprisingly long trip in my own car. I remember the total cost of the 
> fuel (a shade under £40), the cost per litre (81.9p) filling an almost 
> dry tank to the brim, then driving from Newcastle to London without 
> filling - approx 275 miles, and had probably 20 miles left in the tank 
> on arrival. To cut a long story short, I thought the car did very well, 
> better than it ever did with a lambda system and cat (both now binned). 
> Using onlineconversion.com, and a calculator, this averaged out at just 
> under 20mpg where the g is US liquid gallon. If I were to work it
out in 
> imperial gallons, well it drops to nearer 15!
> 
> I used 95 RON unleaded - which is our "regular" unleaded. Read below
for 
> explanation (quote)
> 
> The most important characteristic of petrol is its Research Octane 
> Number (RON) or octane rating, which is a measure of how resistant 
> petrol is to premature detonation (knocking). It is measured
relative to 
> a mixture of isooctane (2,2,4-trimethylpentane) and n-heptane. So an 
> 87-octane petrol has the same knock resistance as a mixture of 87% 
> isooctane and 13% n-heptane.
> 
> There is another type of Octane, called "Motor Octane Number" (MON), 
> which is a better measure of how the fuel behaves when under load. Its 
> definition is also based on the mixture of isooctane and n-heptane that 
> has the same performance. Depending on the composition of the fuel, the 
> MON of a modern petrol will be about 10 points lower than the RON. 
> Normally fuel specifications require both a minimum RON and a
minimum MON.
> 
> In most countries (including all of Europe and Australia) the
'headline' 
> octane that would be shown on the pump is the RON: but in the United 
> States and some other countries the headline number is the average of 
> the RON and the MON, sometimes called the "roaD Octane Number" or DON, 
> or (R+M)/2. Because of the 10 point difference noted above this means 
> that the octane in the United States will be about 5 points lower than 
> the same fuel elsewhere: 87 octane fuel, the "normal" petrol in the US 
> and Canada, would be 92 in Europe.
> 
> Martin

---

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