Quote of the year... haha just playing . Anyways yes Flex Fuel on vehicles nowadays means nothing more than that car engine can operate properly and efficiently on E85 (Octane) fuel. Look up Pre-Ignition/Cylinder knocking if you are interested in finding out why certain octanes must be used with certain vehicles. Such as High Octane (91) is a minimum standard for supercharged vehicles due to the probable chance of fuel pre-detonating and causing severe damage to the engine. If you truck truly is a Flex Fuel vehicle than there is absolutely no problem driving on E85.

 

Except it is not 85 octane, it is 85% alcohol. It is 105 octane

 

Haha I have yet to study up on my ethanol/octane ratings .

 

Yeah, the turbo guys should love this stuff, if they have a FF vehicle. I'm surprised I haven't heard more about the improved perf possibilities with it.

 

My next refill I am trying e85. Just to be sure. The yellow cap that says e85 is flex fuel correct?

 

I did some math recently and figured out the cost per mile to drive on both E85 and 87 octane. The E85 with the local station price was about $.29 a mile in fuel and the regular gas at $4.25 a gallon was $.28 a mile. Savings in the short but long term you lose out a little.

 

yes !!

 

My cap is not yellow but does display that it's flex and they recommend BP....weird!

 

I laughed when I saw that on my gas cap. I purchased my truck last Aug after the BP "incident" and asked myself, "Do they now?"

 

You can always check the VIN to determine if your truck has the flex fuel option. The eighth place in the VIN number is either a 5 or a V. V=flex fuel, 5=not flex fuel.