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Your MPG figures are certainly excellent so you're obviously sensitive to the engines needs and are willing to change out of OD or even down a gear, when needed, Very high gearing can lead to the carbs running open a bit too much to maintain the speed and this means a drop in consumption. You do have some extra power to bridge this gap. Any idea what you think the bhp is now?
The other problem with using this axle is at the other end when the 1st gear comes up to something like the old second gear. Not too kind on the clutch if you live in hilly country.
A dash mounted vacuum gauge will tell the truth. Keeping it out of the red will be a bit more difficult with this sort of gearing.
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