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As far as connecting the pneumatic (or maybe hydraulic) recapture from the engine compartment, I think won't capture the energy from the momentum of the vehicle as much as an extra wheel. If the compressor needs to be driven at the same time as the engine is driven then the resistance from the engine (engine brake) will steal from the compressor and will stop the vehicle too quickly.
If the pneumatic compressor/motor is attached to the transmission or rear axle it will be a more elegant solution although a more complicated and more expensive approach.
I want something that is simple, not so expensive and can easily be added to an existing vehicle so I can sell it as an accessory/add-on and maybe have a small business.
Hopefully it can add an additional 5 miles per gallon so if it costs $500 with installation it might be worth it.
If you drive 12,000 miles a year / avg 23 mpg (without device) = 521 gallons X $3.70 /gallon = $1927 total gas cost per year...... 5 additional mpg / 23 avg mpg = .21 (21%) ...
$1927 * .21 = $404 savings per year !
If it just adds 2.5 mpg its still worth it since you save $202 a year...recoup the cost in 2.3 yrs.
It might also lower brake pad replacement cost.
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