That is a very interesting and precise number. Please share the exact formula that you used to come up with such a precise "0.47 gallons saved" number.
Inquiring minds want to know...
BTW, with modern oil quality, that fractions-of-a-second long "no oil pressure" period isn't nearly the concern that it was decades go when oil technology was in its infancy (compared to today).
The quality of modern engine oils - which has increased the longevity of engines 2x-3x what it was 50 years ago - is more than enough to compensate for those extra startup cycles.
Will the extra restarts shorten the life of the engine? Maybe. As an engineer, I'd be more than willing to bet that the difference it will make in engine longevity will be FAR, FAR less than the increased level of wear you would see from shooting +P ammo in your 38spl 1960's era revolver.
Any additional wear will be MORE than compensated for by the fuel savings, especially when the cost of regular unleaded gas is in the $4-$5 per gallon range, as it currently is and will almost certainly continue to be for the foreseeable future.
Even at an average of $4.50 per gallon, that 17% fuel savings - going from 30 mpg to 35 mpg - adds up to roughly 7.5 cents per mile. Over a span of 200k miles driven (low end estimate of a modern vehicle's engine longevity), that is just under $15,000 saved in fuel costs.
So, unless you actually spend more than $15,000 in extra repair costs (very unlikely), you are still AHEAD of the game.
These kinds of things are always a trade-off. There is no free lunch. But if the savings are greater than the cost that it takes to achieve them, that is a WIN!
The numbers don't lie.
As always, this is just my perspective/analysis, and YMMV.