Quote:
Originally Posted by loganboyd  So i've burned 4 tanks of 87 octane in my c350 now and on this most recent tank i experienced this MPG perforrmance.
65 total miles
6 miles of city with stop lights
59 miles of highway w/cruise set at 75mph
MPG was at 24.5 when I entered hwy
MPG was at 29.7 when I exited 59 miles later
I did hit my brakes a few times and some of the driving was between 65-70mph but at least 90% was at cruise on 75mph. The drive has some gradual hills and descents but is pretty flat overall. |
Isnt 87 octane bad for your engine in the long term? Depoit build up, etc.. ?