[DeTomaso] Predicted mileage at 200 MPH

[j g]

quick rule of thumb  .55lbs per hour per hp in a
decent engine. 
If 500 hp is your ticket then 
that is 275 pounds per hour  or 137 pounds to go 100
miles at 200 miles per hour gasoline weighs about 6.1
pound per gallon  so 22.4 gallons with a normal  N/a
engine

 if you have a great engine and good BSFC then
.45lbhr/hp can be achieved  so that is 22.4*.45/.55  .
18.7 gallons with a great engine. 


--- Ken Green <kenn_green at yahoo.com> wrote:

> 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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