I don't usually drive much so I switched to top tier premium fuel in my Badlands. As far as the cost difference I view it as I'm buying my Bronco a happy meal.
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10300 miles on my 25 OBX. Lifetime average both surface roads and highway 25.9. Best highway yet 32.9 75 mph flat Florida highways light traffic. Life is good 
Still, doesn't mean I should buy 91 'cause it's cheaper than SoCal 87.
There's so much FUD and cognitive dissonance on most things auto-related, and octane rating is high on the list. I knew what the EPA estimates were going in and I'm right in there on 87. Since that's what Ford recommends, I maintain my warrantee if it suddenly grenades itself (which it won't). The idle compression ratio on the 2.0L is 10:1, right on the cusp of where increased octane is suggested, depending on application.
As far as the turbo factors in, at 15 psi of boost at sea level an engine with a 10:1 compression ratio has an effective compression ratio of about 20:1. While this ratio does flirt with the detonation knock limit, seeing as how I'll never be at sea level (forever 1200'MSL and above) and don't thrash my engines, it's not a concern. At least for the last three turbo cars I had before the BS, which all were perfectly fine on 87.
End of the day, everyone should run what they're comfortable with mechanically and financially. My experience is mine and doesn't prove or disprove anything.
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ya, when are you guys going to get onboard and go to the imperial gallon instead of the puny little US gal, I get tired of converting twice
thoes numbers are for going to work an back with All Terrain tires and doing 75 mph on the main highway and 60 mph on the back road (all mountian roads). slower when it is snowing which it might be tonight
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I did 4000 miles on regular, then 4000 miles on premium, absolutly no measurable fuel consumption change at all doing the same drive. so it is about that 3000 miles drive was in the mountians to work and back, leaving my house is a 8 mile long grade 6 to grade 8 hill I hit going to work every day. I believe that 4000 miles was about 2 months of driving to work and back. now I don't speed (the highway is 120kph already about 75mph, and the back road is 55 to 60mph and theres not room to go much faster on that road)
if you drive in the throttle all the time and do heavy accelerating then premium will show a little bit of better milage than regular because when the boost is up and the rpms are up it can add more timing to take advantage of that. but if you are like me, get up to speed and put the cruise controle on for your hour long drive each way to work, then you will not see any benifit I have found.
my experience that 87 in my bsbb 1.5 rattles - like the engine is coming apartStill, doesn't mean I should buy 91 'cause it's cheaper than SoCal 87.
There's so much FUD and cognitive dissonance on most things auto-related, and octane rating is high on the list. I knew what the EPA estimates were going in and I'm right in there on 87. Since that's what Ford recommends, I maintain my warrantee if it suddenly grenades itself (which it won't). The idle compression ratio on the 2.0L is 10:1, right on the cusp of where increased octane is suggested, depending on application.
As far as the turbo factors in, at 15 psi of boost at sea level an engine with a 10:1 compression ratio has an effective compression ratio of about 20:1. While this ratio does flirt with the detonation knock limit, seeing as how I'll never be at sea level (forever 1200'MSL and above) and don't thrash my engines, it's not a concern. At least for the last three turbo cars I had before the BS, which all were perfectly fine on 87.
End of the day, everyone should run what they're comfortable with mechanically and financially. My experience is mine and doesn't prove or disprove anything.
91 eliminates that condition and i can stop worrying - whew !
the cost is minor to me
My absolute best is 30 and my lifetime average is 23.3. I donāt really pay much attention to the computer but I think you are correct that it is normally higher than actual.
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strictly town/county roads only averaging 30 - 45 mph
expressway travel verboten
too much stimulus overload resulting in excitotoxicity of the neurotransmitters
*tips straw hat way back on the head and contemplates life at 28.6 mpg
expressway travel verboten
too much stimulus overload resulting in excitotoxicity of the neurotransmitters
*tips straw hat way back on the head and contemplates life at 28.6 mpg