Thanks for the replies guys, I'm new to the world of hybrids. It's definitely a lot cheaper to run than my old m35 stagea that's for sure but yeah well shy of the claimed figures so far, hoping the batteries not poked (although it came with a 3 year warranty for the hybrid battery as well). Wondering if it'll take another tank for the ecu to figure out the higher octane if it's been run on 91 for a bit?