I had some MIL light alerts. My OBD scanner showed “ random intermittent misfire”. Car is a 2002 Plus8 on Gems management. The misfire eas not noticeable. The stats package within Gems basically monitored misfires until a trigger level was reached. Did the usual checks but it still remained. Very occasional not a regular thing. I tried Shell V-Power (97 octane) and that stopped the issue. I also got a couple of extra mpg. I felt the engine ran better as well. Maybe wishful thinking but ....
A few years ago I had a Focus turbo diesel as a commuter. 120 mile round trip, mainly M4. I tried Millers booster in it. A bottle cost about £12 and dosed several tankfuls. Over the time for a bottle my mpg increased and I saved about £36 so a net saving of £24. The car ran well. A mate tried some Millers in his Golf but didn’t see any difference. ( maybe some VW map jiggery pokery?
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The higher octane probably gave better burn and possibly counteracted the random misfire detection. The only possible cause in the Mog I could find at a later date ( checking plugs) was the misfire was reported in cyl3. The ignition lead on that plug was not quite as tight a fit. Magnecor leads so a plus there. I gently squeezed the plug connection and it was as tight as the rest. Now the driving mileage is increasing again I am monitoring the MIL fault frequency. None so far even with 95 octane petrol. I will be continuing to use more 97 though. The mileage covered is not going to increase fuel costs to undesirable. I have not tried the Millers booster for petrol yet and I might try it to see if it has any effect. Might be cheaper than higher octane from the pump. Not a one-shot test though. An extended use to clear the initial stage of use.
As for E10 compatibility, the engine is cleared as ok but not sure about the rest of the fuel system. Flexi pipes, pump seals etc. Time will tell.
