Very nicely done - this report by Goeff. He went through some great country. I notice he was surprised at how "Western" parts of California felt, but that was the Old West, that and Texas, with much of the rest of the western states being settled later.
Good choice of route for sight seeing, but I think if saving fuel was the object, a straight run through Arizona, Nevada eventually to Eastern Washington and then Canada might have gotten to the 10 gallon limit. But then if that was all that this was about, like Goeff says, he could have gone slower and used other methods to conserve diesel.
His trip also shows that one doesn't have to drive that fast to go cross country on an Enfield.
Nice, relatively trouble-free trip - obviously good preparation.