I put a tank of shell premium gas in my car yesterday and my car is running a lot better I mean it wasn't running bad to begin with but now it's got more acceleration and it just seems to run smoother. I know I’ve heard on older cars to put premium gas in your car every once in a while put premium gas in your car to clean it out. The tank before this one I put some fuel injector cleaner with regular gas as usual and didn’t notice a difference. Why is this?
If I’d be you, I wouldn’t mess with all of those additives and gas types and just use the recommended type.
Mostly it is just placebo. If you have a 2020, there is no need to use any additives as it is too new to see any benefit.
Even in sports cars meant to run higher octane, you can not go from 89 to 93 and notice an immediate change. The ECM has to tune the octane tables and it takes at least one full tank of fuel to do that. The Kia Forte ECM is not programmed to adjust the octane table upwards and take advantage of extra octane for power. Therefore if you have been running 89, switch to premium (91 or 93 depending on your area), and immediately 'feel' a difference, then it is just a mental placebo effect.
You should always run whatever the manufacturer suggests for your vehicle. Running premium once in a while to clean the engine is a myth that has been debunked for quite some time now.
Yeah I thought so but the dealer recommended putting an additive in there recently. Of course they wanted to charge me but I was like no I can do that myself