Here is some new work I did on mutual intelligibility in the Romance family. If you speak any of these languages, feel free to chime in. The one figure I am worried about is 0% of Italian understanding of Romanian. One informant said that, but I have a feeling it is higher than that.
Intelligibility Figures for Romance Languages
Intelligibility for Spanish speakers, oral: 80% of Asturian, Aragonese and and Extremaduran, 78% of Galician, 62% of Catalan, 50% of Portuguese, 25% of Italian, 6% of Romanian, 1% of French, and 0% of Sicilian.
Spanish has 95% written intelligibility of Ladino, 93% of Galician, 87% of Catalan, 78% of Portuguese, 50% of Italian and Romanian, and 16% of French.
Catalan has 94% oral intelligibility of Valencian, 63% intelligibility of Belearic, 27% of Italian, 5% of French.
Catalan has 27% written intelligibility of Italian.
Asturian has 82% oral intelligibility of Mirandese and 71% of Portuguese.
Mirandese has 82% oral intelligibility of Asturian and 71% of Portuguese.
Portuguese has 95% oral intelligibility of Almedilha dialect, 86% of Galician, 71% of Mirandese and Asturian, 58% of Spanish, 40% of Hermisende dialect, 55% of Catalan, 25% of Leonese and Italian, 17% of French, and 5% of Romanian.
Portuguese has 90% written intelligibility of Italian.
Galician has 58% intelligibility of Catalan, and 0% of Extremaduran and Andalucian Spanish.
French has 30% oral intelligibility of Catalan, 27% of Portuguese, 16% of Italian, 13% of Spanish, 7% intelligibility of Romanian, and 0% of Sicilian.
French has 90% written intelligibility of Catalan and 70% of Portuguese.
Romanian has 70% oral intelligibility of Istroromanian, 40% of Italian, 25% of Spanish, and 15% of French and Portuguese.
Romanian has 60% written intelligibility of French, 45% of Galician and Piedmontese and 33% of Italian.
Italian has 40% oral intelligibility of Catalan, 16% of Portuguese, 11% of French, and 0% of Romanian, Arpitan and Sicilian.
Italian has 75% written intelligibility of French and Spanish, 25% of Portuguese, and 20% of Catalan.
Piedmontese has 0% intelligibility of Arpitan.