I honestly don’t know if to run 87 gas or 91 I been using 91 does it increase my gas mileage and is it good for the car /VT
This would appear to imply 87 octane caused four fuel injector failures. Can you elaborate? This seems unlikely unless you were coincidentally running some very crappy cheap gas.I ran 87 in my car the first couple years, because the salseman said it was cool. 4 fuel injectors later and i only run 93octane now, 91 if 93nisnt available. I recommend sticking with 91 and above, not worth saving the few extra dollars a fill up when your car is in the shop
Right. Addition of ethanol does one of two things depending on the bias of the ECU, especially in actual flex fuel vehicles. It will either improve performance by adding more fuel which results in lower fuel economy (which is how my ECU reacted by default) or it will hurt performance by not adding extra fuel and will result in maintaining about the same fuel economy or maybe a slight gain, but the economy benefit is mostly just that it is a cheaper fuel. This is the bias of a lot of Ford Flex Fuel vehicles, which is why a lot of Ford guys will tell you Flex Fuel is the worst thing ever meanwhile the Nissan guys find themselves doing accidental burnouts. Lol^^^^^This is pretty true^^^^^
Also E will lower fuel economy and if not tuned for the fuel it can actually lose power in some cases.
These cars from the oem is tuned to make more power and run best on higher octane lower E fuel. Lower octane and/or higher E fuels will not perform as well. The ecu is limited on how much it can adjust for octane and E content but can be ran on 87 in some cases or E fuels in some cases. Why hyundai said 87 is fine in these cars I'm not sure other than not trying to deter sales.