I've been wanting to do this for quite a while. Earlier this week I found a bug in the service statistics report of my Vehistics program. I set about fixing it, and then decided to finish (mark off the todo) the fuel statistics. Got them down between 1/4 and 1/7. I can sort on the columns, there is an indicator on the one with current sort.
This is written in Clipper 5.3. Fun stuff!
Samples of data going back to 1999-ish. I have older data going back to early 90's but its not been imported into the database due to the format it resides in. Yup, there used to be a BP station right by me. I didnt used to track the fuel grade, so where not tracked I had assigned just plain old regular in absence of knowing:
