I thought I could give some input to educate myself some more as I'm a student pilot
The AVGAS used in a Cessna 150 at my flying school is 110LL and is colour coded blue. The grade of fuel is its octane rating although it is impossible to have an octane rating highter than 100 so this is a performance number. MOGAS for you car is 80-90 im prety sure.
And the LL stand for low-lead, I gather you know what lead helps with...
I didn't realy anwser your question...