Here's a set of conversion tables I worked up for octane ratings. The
European octane rating is RON, where as the US octane rating is an average of (RON+MON)/2.
The following table comes from the following web site:
http://www.btinternet.com/~madmole/R...RONMONPON.html
Actual octane rating table
| EURO RON | MON | US: (R+M)/2 |
| 90 | 83 | 86.5 |
| 92 | 85 | 88.5 |
| 95 | 87 | 91 |
| 96 | 88 | 92 |
| 98 | 90 | 94 |
| 100 | 91.5 | 95.75 |
| 105 | 95 | 100 |
| 110 | 99 | 104.5 |
Formula for converting EURO
to US rating
I've also come up with a pretty good formula that approximates US
octane rating based on EURO RON rating, and visa versa. The formula is
US=RON*(21/22):
| EURO RON | US (R+M)/2 |
| 90 | 85.9 |
| 92 | 87.8 |
| 95 | 90.7 |
| 96 | 91.6 |
| 98 | 93.5 |
| 100 | 95.5 |
| 105 | 100.2 |
| 110 | 105 |
Formula for converting US to EURO
octane
And reversing that forumula, wet get: RON = US*(22/21)
| US (R+M)/2 | EURO RON |
| 87 | 91.1 |
| 88 | 92.2 |
| 89 | 93.2 |
| 90 | 94.3 |
| 91 | 95.3 |
| 92 | 96.4 |
| 93 | 97.4 |
| 94 | 98.5 |
| 95 | 99.5 |
| 96 | 100.6 |
| 97 | 101.6 |
| 98 | 102.7 |
| 99 | 103.7 |
| 100 | 104.8 |
