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  1. M

    Premium fuel ?

    Idk where you're getting the curb weight numbers but they are within 100lbs with the 4.6L. Either way I'd agree aero probably contributes more since the tailgate is usually a huge resistance on trucks. Tires are going to be similar for both in that trim FE wise. Also a note on spark, just...
  2. M

    Premium fuel ?

    Either one is "safe" as in you are not likely to permanently fail anything, but prolonged exposure to increased knock events especially during hot/high load events is what you want to stay away from. Even if you used 87 daily and then used 91 for long trips loaded down you'd be fine. The...
  3. M

    Premium fuel ?

    I wouldn't discount it all the way. For instance we used to use Marathon gas in our lab and we had to stop because the additive package caused a black tar buildup inside the combustion chamber, block and head. Switched to Shell and we don't have those issues anymore. Marathon is labeled as a Top...
  4. M

    Premium fuel ?

    Lexus vs. Toyota customers. All the brands do it to squeeze out an extra 10-20hp so they can nudge out the competition as if consumers care. Probably one of the things that sucks when cross shopping with Lexus.
  5. M

    Premium fuel ?

    That is pretty outdated advice. I work hands on with engine calibration and know a lot of competent mechanics; they are not all of equal skill and often times are not knowledgeable of ECM control. Not to mention no mechanic has full access to the ECM maps, even HP tuners or VF tuner doesn't have...
  6. M

    Premium fuel ?

    From a detergent perspective dumping a tank of premium in once in a while probably will help, but you could also just grab a detergent adder from a parts store and add that to your 87. BTW random sampling of 87 across the US is really closer to 88 than 87 according to some internal info I have...
  7. M

    Premium fuel ?

    I wrote this a while ago... Octane/Knock System Has way more detail than you might need. Long story short 120mm nailed it on the head.
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