Ray G Tennancour 1 Posted June 2, 2019 Share Posted June 2, 2019 Greetings All, Well, It's been 6 months since purchasing my 2019 Spark LT. Thought I'd share some great news (in my book). In this forum I read that for the best miles per gallon rating, one should use 85 octane after breaking in the engine @2,000 miles or so. Well, that I did and following is my record for the last 4 fill-ups plur the current stats. 04-01-19: 45.1 ave. mpg @ 3,314 total miles (This was my first tank of 85 octane) 04-19-19 47.4 ave. mpg @ 3,630 total miles 05-07-19 47.8 ave. mpg @ 4,021 total miles 05-25-19 46.6 ave. mpg @ 4,359 total miles (Chevy service crew brought the average WAY down) 06-02-19 48.0 ave. mpg @ 4,552 total miles (As it sits right now in my driveway) And about the service, I kept hearing a small "clanking" noise from the rear passenger side. Of course, whenever I brought it in, (3 times) we were unable to get the noise back. So I recorded the noise with a little digital unit and the 4th time I brought the Spark in, I just played the recorded "clank". In 15 minutes, they found the spare tire was not firmly firmly seated. They corrected same, and I have had no repeat. Link to post Share on other sites
Ray Dockrey 97 Posted June 3, 2019 Share Posted June 3, 2019 Those numbers seem really off. How are you calculating your mpg? And do you do any in town driving? Link to post Share on other sites
Mr.tozzi 66 Posted June 27, 2019 Share Posted June 27, 2019 For best performance and fuel economy you should run what the manufacturer recommends. Running 85 octane fuel is not recommended. Read the book. Link to post Share on other sites
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