You're welcome. I also found this from the Shell website.
"Do oxygenated fuels and reformulated fuels have an increased risk of fuel system leaks, and consequently increased risk of vehicle fires?
Some rubber materials used in fuel system hoses and seals in vehicles before the 1980 model year, MAY have been susceptible to damage by oxygenates, especially alcohols. Vehicle’s built after the 1979 model year have fuel system parts resistant to most gasoline oxygenates. Some parts may not be resistant to methanol, but Shell gasolines do not contain methanol. In addition gasolines formulated with property extremes may lead to fuel system leaks. However, Shell has specifications to assure Shell gasolines do not have these property extremes.
With passage of so many years, and consequent aging and wear, it is likely parts susceptible to damage have since been replaced by more modern, oxygenate resistant materials in the vast majority of cars. Normal aging and wear of fuel system components can contribute to fuel system problems. Therefore it is prudent to periodically inspect and service fuel systems as vehicles get older or accumulate miles - whether using conventional, reformulated, or oxygenated gasolines. If you suspect the fuel system parts in your car are at risk, have the fuel system inspected and serviced by your car repair agency. Studies with reformulated and oxygenated gasolines of moderate properties have shown no more risk of fuel leaks than conventional gasolines."
Anecdotally speaking, having owned pre-1970 Detroit iron, it was not uncommon for carb rebuild, esp. on those cars which I drove as daily summer drivers. Modern fuel sped up the drying/hardening of the rubber pieces.