[DeTomaso] Predicted mileage at 200 MPH

[Michael Shortt]

>From Wikipedia.

At race speeds, NEXTEL Cup cars get 2 to 5 miles per gallon.
[11]<http://en.wikipedia.org/wiki/NASCAR#_note-10>
[12] <http://en.wikipedia.org/wiki/NASCAR#_note-11>
[13]<http://en.wikipedia.org/wiki/NASCAR#_note-12>Consumption under
caution can be estimated at 14-18 mpg, based on comparable
engines generally available to the public. Interestingly, the *rate* of fuel
consumption tends to be the same regardless of the actual speeds of the
cars, as teams change gear ratios for each race to ensure that the engine
always operates in its optimum power band; however, the fuel *mileage* will
vary for each race, depending on the maximum speeds attained.

another site said this

Suite101: NASCAR Glossary

"Question: On average, how is the gas mileage on the race cars?
ANSWER: Depending on the racetrack we get 6.5 miles-per-gallon (mpg)
to 7.4 mpg on restrictor-plate races and 3.5 mpg to 4.6 mpg on open
tracks."


Michael Shortt


On 4/4/07, David & Marilyn Bell <davidabell at worldnet.att.net> wrote:
>
> I don't think that's low enough.  I routinely run my Pantera's 20 gallon
> tank practically dry after 4 track sessions at TWS, which usually ends up
> being very close to 100 miles.  That works out to only around 5 miles per
> gallon through my 750 Holley using my measly 302 rwhp.  And I'm not even
> running WOT all the way around the track as I do have to brake
> occasionally.
>
> Dave Bell
>
> -----Original Message-----
> From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com]On
> Behalf Of Ken Green
> Sent: Wednesday, April 04, 2007 3:44 PM
> To: detomaso at realbig.com; Blaine Carmena
> Subject: [DeTomaso] Predicted mileage at 200 MPH
>
> Out of curiosity, I tried to estimate how much gas would be burned to
> travel
> 100 miles at 200 MPH assuming 500 HP is required to maintain speed.  I
> came
> up with:
>
>
> 1 HP = 42.21 Btu/min
> so,   500 HP = 21,205 Btu/min at 100% efficiency energy conversion
> but assuming 33% efficiency, 500 HP requires 63,615 Btu/min
>
> 1 gallon of gasoline contain 115,000 to 125,000 BTUs
>
> at 120,000 Btu/gal, 500 HP will burn about 1/2 gallons per minute
> so, at 200 MPH, it takes 30 minutes to travel 100 miles, and 15 gallons of
> gasoline.
>
> It seems reasonable, about 6 MPG.  I've never done this kind of
> calculation before, does anyone see an obvious error?
>
> Ken
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-- 
Michael L. Shortt
Savannah, Georgia


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