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anyone switching gas grade?

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  #21  
Old 06-10-2014, 04:30 PM
ppgoal's Avatar
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Join Date: Sep 2006
Location: Holland MI
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An old, resurrected thread. I'm still using mostly mid-range but occasionally fill with premium if I find a good deal, or alternate half tanks of mid-range and premium. I have never seen a difference in mpg either way and have doubled my mileage since the last post to 231k. The only thing that affects mileage is speed. Driving 55-60 results in 24-26mpg and my normal 75-80 drops it to 23 mpg.
 
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  #22  
Old 07-09-2014, 09:07 PM
rolexjimt's Avatar
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Join Date: Nov 2013
Posts: 11
Default 89 octane gives better mpg
Originally Posted by modset
i always use premium grade gas but prices are killing me. anyone made the switch to midgrade to save a bit of cash? or even switch back and forth?
I have changed from 93 to 89 octane. Mpg with 93 was 16. With 89 is 19mpg. I have gone back and forth w/same results. Can anyonr explain this?
 
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