I have the edge tuner on my 2004 ford f150 fx4 and i will be running premium gas on level 3 performance level, but if for some reason like my g/f is driving it and forgets to put premium in will it do any harm to my engine or anything. Thanks

 

Protip: Get a new girlfriend if she does not put in premium.

 

Probably not if it is mixed with some 93 and it is not driven hard. If the engine is put under a load and the octane is not high enough, you will be running lean and will usually hear it ping. Just change it to level 2 as soon as you can until that tank is run out.

 

ok thanks guys. dont ever plan on it happening, but you know how girls can be

 

She can't remember that it needs 93 octane? Will she forget she has a boyfriend at the bar, too?

... joking.

 

Bluejay, are you sure about this? Why would the engine run "lean"? Yea, it should knock, especially under load, but the A/F mixture ratio will not be effected.

However, the effect, running "hot" and damage to the engine may be the same, and that may be what you were talking about.

- Jack