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EPA highway is 28 (27 for automatic) so your mileage seems to be OK. My '08 MT 128i 'vert has averaged 27.5 over 40k miles with 80% highway driving using 93 octane - but this falls off by about 10% when using A/C and another 3% with E10.
Also, are you using the OBC or true calculated mpg? And don't forget to check the odometer accuracy - mine actually under-reads by nearly 2%.
Tom.
Last edited by Tom K.; 09-13-2012 at 07:29 AM.
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