How did I get 15.5 MPG?

[Efrain]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">

I get 10 mpg on long trips and around 8.5 mpg around town. Believe it or not, if I have a strong head wind I will get as low as 6 mpg. </div></BLOCKQUOTE>

PhilD, your mpg's seem more reasonable to me. after 10 months, I still can't shake off the 10.9 mpg average I'm getting. Either my H2 was made on a Monday or those guys are just plain lucky. Also, this is the first time I read (in this forum) about higher octanage giving you higher mpg's. Wouldn't the owner's manual say,"Use 87 octane gasoline unless you want better gas mileage, then use 97 octane" What gives?