Originally Posted By: wemay
I don't notice a mileage difference, but my 2.4 absolutely runs better on Premium fuel (93 here). It sometimes pings ever so lightly on up-shifts from 3rd to 4th on tip-in when using 87. Hyundai checked for codes at my request and could find none, advising that the slight ping is normal as well, no issue what-so-ever. Just a result of tunning the vehicles to edge of advanced timing to eek out every ounce of mpg. But mine is also 'blessed' with very high compression ratio and GDi.
If your 2014 vehicle is pinging, something is wrong.
Originally Posted By: Wolf359
Originally Posted By: dblshock
I've heard enough, 'If your engine spec is 87 octane fuel there is no benefit to premium 91' 'waist of money'
Why do my 2.4's run stronger on 91?
Why do I achieve 2-3 more mpg.?
There's probably something wrong with your car.
The BTU content of regular and super is about the same, some actually say super has less.
If there's carbon buildup or whatever in your car and the system is retarding the timing, then you will see slightly better gas mileage and performance. However if the engine has not had the timing retarded there should be no benefit to running super instead of regular.
Premium gas has less energy that regular gas. The combustion inhibitor takes up space and does not provide energy.
Originally Posted By: wirelessF
I find the pinging to disappear in my Chevy 5.3L V8 when in the upper RPM range when I ran 91 octane in a couple of fillups. Does the truck see upper RPM operation let alone revving above 2000RPM's? Nope, well maybe when I want to pass someone and the RPM's jump from div>
My 5.3L acted no differently when I ran a couple of tanks of 93. The mileage remained about the same and engine sounded the same.