Several diesel truck sites have discussions on propane injection, . . .I know of a couple of farmers that are using this on their tractors. They all note better performance & better (combined) fuel economy. Just off hand I don't remember which sites I was browsing however, you might Google "propane injection" & see what comes up.
In-so-far-as drag coefficient, . . .anything you can do to make the front facing part more pointy would create better airflow, . . .the problem is, . . .how do you make a proverbial concrete block going down the road, aerodynamic without making it look like a POS????
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