I ran a few gas stations for Gulf Oil GB, back in the sixties and, water in tanks was quite a problem, back then. Just checked the price in the UK. It's at around $8.65 a US gallon ! I remember paying half a crown, for a gallon for my motorbike and, 77 cents a gallon in Iowa, for my RV.........Roger.

 

I had been using 87 octane for quite a long time and never experience pinging even in uphill drive. Gas prices cost high here in San Jose, CA, ..too costly to used premium gas all the time. I do add lucas oil to my tank every fill up (5 ml ), it surely does lubricate all injectors and all parts of the fuel system. So far, it never failed emission and the engine runs well. With these experienced, I am definitely adding LUCAS OIL to all my cars.

 

You'd have to compare your results to those that DON'T use Lucas to state whether there are benefits or not. I would think that 5 ml of oil added to 70,000 ml (70L) of gas isn't enough to do much one way or the other.

 

Altitude effects need for high octane. I am at 7,600 ft ( about 2,300 meters- wag ) and anything other than regular is money out the window. Unless your car has a turbo.

Mine is a 4.0 inline 6. When I get below about 4,000 feet the octane level purchased goes up.

 

i've got 5 of them on the road a 6, 3 8's and a v-12. never used anything but regular. but i don't put my foot in them either. not needed to drive around town