unmeloy wrote:well i am currently doing a test in town driving and highway combined with both regular and premium... just took a 300 mi trip with regular almost all highway... logged those results. got back and topped it off with regular and gonna drive it till its on E... then fill with premium and run in town, and next long trip will log with premium.... will report back
Been thinking of doing the same thing since I fill up every 4 days. Difference with my test being I have a bullydog tuner & would switch to the premium tune.
Just did some math....
Right now I get about 18 - 18.5mpg's using 87 octane
87 is about $3.21/gal right now.
Say I burn 18 gallons. That'll cost me $57.78.
At 18 - 18.5mpg those 18 gallons would take me 324 - 333 miles
If I spend the SAME $57.78 on 93, which costs about $3.41/gal it would buy me 16.9 gallons.
For 93 to be worth the extra cost I would have to travel the same 324 - 333 miles on 16.9 gallons instead of 18 gallons.
That means in order to make it worth switching to premium I"ll need to get 19.17 - 19.7mpg's with 93 octane.
Maybe I'll fill up w/ 93 the next couple of fill-ups and change the map on my Bullydog GT to see if it's worth it for me... but SRONGTLY doubt it.
Been using 87 octane since I got the truck at 84k miles. Has 150 on it now and I haven't had any fuel related issues even under very heavy (4-5k lb) towing.
I don't see any reason whatsoever to switch to 93. It's not any better for your engine in any way, shape or form.