My 340 getting 6 mpg

Workingdog1 said

Go for a real drive. Top off tank in Malibu South of Pepperdine and drive to Neptune's Net or beyond. Check your odometer by CalTrans markers on Highway 1 variously placed at improvements as they're marked to 1/100 of a mile.
You need a long enough cruise with no pedal pushing to get the true picture.

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I have driven to Neptunes.

I filled up in San pedro and by the time i got to that first chevron in santa monica on pch i was already at half a tank. And i took the 110 to the 405 so i was at a consistent throttle. I drove to rock store. Then to neptunes. Then home and i used a whole tank. That was before we tuned it this past weekend. I will drive it up again.