I think that maybe the “economy test cycle” needs a rethink, or something.
Especially if the car has only 2 gears (1958 auto), with a HUGE engine. (904cid - 14.8L)
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Is it too much or too little? 
I made a suggestion about the test cycle today:
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6.7mpg sounds reasonable for a big v12 of the era, actually it’s quite good. The ford super duty 8.8 liter 534ci v8 equipped trucks only got 5-6 with a 3 speed manual
I was more thinking about the rpm’s at the different speeds.
How much torque is that baby making at idle?
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Well the sheer size of this thing places it somewhere around heavy truck engines, which would normally work at 400 rpm, so I see nothing really weird here. Especially with the torque probably exceeding 1000Nm.
Yeah, I don’t see a problem here considering it is a 14.8 L engine 
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