I've gotten 29 and 31 mpg on the highway...wouldn't put the numbers too low.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth

Sorry no harm meant, but for a M103 I don't believe you...Unless you are driving downhill, your odometer is probably counting miles incorrectly. Most M104's which get much better fuel economy struggle to get above 26/27.
If you really did achieve above 30mpg, you would be the first and let us know what you are doing!!

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

agreed ps2cho.How can you do?

I tracked the distance by GPS so no odometer variable. Average speed was about 60mph, all highway. Each time the fuel was filled up right to the lip for consistency. I didn't believe it at first either but I consistently get upwards of 25mpg on the highway every time I do out my mileage. My fuel pumps are making a ton of noise so maybe they just aren't pumping as much in their old age, idk. I generally get pretty good mileage out of cars, I've hit 30mpg in my 300SD several times which is the "impossible number". I don't think I have much of a feather foot, but I guess the numbers suggest otherwise. I used to get about 28-29mpg out of my twin turbo stealth, and hit 42mpg in my gf's eclipse. Been doing mpg calculations since I was 16 too, so no calculation error here. Plus my city driving (90% of mine) is pretty typical, 15mpg.

edit: sorry for the thread hijack

__________________
TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth

1990-92 300E are with 2.87 rear diff. ratio. 86-89 with 3.07. It may explain better MPG on HWY.

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1987 300D Turbo 170K (sold)
1990 300E
1992 300D 2.5 Turbo
2003 Audi A6 4.2