When it comes to aircraft, it's gallons per hour. Not sure about rockets, though.

With Bloodhound, I'm sure they'll just measure the weight. i.e. tons per run

Most aircraft are the same, aren't they? How many tons on take off, how many tons per hour of flight, how many extra tons to get that fuel off of the ground (nested loop).

I remember a mate of mine having a hand in British Airways software to calculate fuel per flight. Curb weight, passenger + luggage weight, fuel weight, error margin. Gets quite complicated and you really don't want to get it wrong.

http://www.bbc.co.uk/news/science-environment-41747995

"Slow speed" runs start today. Around 200-300 mph.

It should also be remembered that Bloodhound is about much more than just the land speed record, its about inspiring the next generation into engineering and technology in as exciting a way as possible. They have been into schools all over the UK and getting kids involved to explain how the car is built, the mathematics and electronics involved in the design and build stages.

Edit:

http://www.bbc.co.uk/news/science-environment-41747995

Thanks for the up-date DD 

I truly wish them the best of luck and hope they do eventually get to 1000mph.

However, as we move further into the 21st century I can't help but think this should be the last attempt using fossil fuels. Next we need to look at making an electric land speed record, with everything we learn from Bloodhound surely it can be done.

Best of luck chaps 

Good to see Bloodhound getting there. Been all over the news this time.

The speed nutters are way ahead of you, Data. Wiki.
Only 341MPH at the mo.

http://www.bbc.co.uk/news/science-environment-42141898

http://www.bbc.co.uk/news/science-environment-43007415

http://www.bbc.co.uk/news/science-environment-43290177

Bit behind again lol 

http://www.bbc.co.uk/news/science-environment-44129708

http://www.bbc.co.uk/news/science-environment-44112519

Happens; especially with a project this big. Thanks, DD.

Hopefully something interesting for you to read while your stuck with not a lot to do Dave 

https://www.bbc.co.uk/news/science-environment-45086044

Unfortunately this project has been axed, it is no more.

QuoteA 1,000mph race car project has been axed meaning the supersonic vehicle is on the market for the price of a Ferrari.

It is possible that it might get a new lease of life but it's not looking good right now.

https://www.bbc.co.uk/news/uk-england-bristol-46480342