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Given the short distance between heater and expansion chamber, and the improving qualities of insulating materials, the loss should not be all that important.
But I agree that we will have a loss in temperature, therefore in air volume, therefore in effiency and range.
With the low cost of the air-fuel however this loss should not be dramatized
With average cost of KW in Europe we reckon to fill a 100L @ 300 bars tank for less than 2 USD, ergo 6-7 times cheaper than diesel-fuel (approx).
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