If you have found Petrol has stopped updating prices and in fact possibly crashing then you need to get the new version.
Two ways
1. (preferred) run petrol and leave running for about 10 mins, don't try and refresh. Look in your petrol folder, if you see a file called dbtlttl.np change it to dbtittl.np and restart petrol.
2. Re-Download from my forum and just unzip the dbtittl.exe over your existing one.
If anyone does any of the above, please let me know how it goes. Oh and try and click on some of the google Ads on my site