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Vacuum canister possibilities- fire extinguishers have expiration dates and can no longer be used in schools and commercial transportation. There is probably an expired one in your garage. If you need a larger canister, helium canisters for party balloons are single use and could be repurposed.
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60 mpg hwy highest, 50+mpg lifetime
TDi=fast frugal fun 
https://ecomodder.com/forum/showthre...tml#post621801
Quote:
Originally Posted by freebeard
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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