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Just bought my first "high mileage" vehicle (BMW 335d) which now has 500 miles on the clock.I just finished a 70 mile Interstate trip,the last 30 miles of which were clear sailing (no tie ups,braking or reduced speed).At the start of that last 30 miles I reset the trip computer and set the cruise at 62MPH.When I got off the interstate my trip computer was reading 49.0 MPG.Is this likely to be correct?? I've read that trip compuets can be a bit "optimistic" but even allowing for a 10% margin of error that still comes out to about 44MPG.

Thoughts,anyone?

That is entirely possible. You may have had a slight tailwind or a not as noticeable downgrade, but that's not far off from what the actual number would be.

Like I mentioned before, Cruising at 50-55mph gave 50mpg, so with a couple of the above scenarios, 49 is very possible.

After 14 tanks I experienced my trip computer to be in average 19% to optimistic. So multiplying the trip computer estimate with factor 1,19 gives me a fairly accurate figure I can count on when judging when it's time to refuel the vehicle.
It's always best to 'calibrate' the trip computer of a particular vehicle thru precisely calculating the mileage when topping off.

It's definitely possible. If you track trip mileage for a while it becomes apparent how much unexpected transients in the driving cycle drag down the mileage. Diesels can do wonderful things at a steady cruise.

To get a very good feel for the FCD accuracy, you need to fill up at the same station, pump and direction. Also stop at the same time: ie 3 clicks

The 335D is quite capable of some outstanding mileage though. Read CleanMPG Reviews the 2009 BMW 335d Turbo-Diesel (http://www.cleanmpg.com/forums/showthread.php?p=202194#post202194) if you haven't yet.

Enjoy your car as you have the best of both worlds packed into one auto.

Just bought a Mercedes E-320 Bluetech
Been lead footing it hard around town and have been getting 31.7 with jack rabbit starts and fun with the 400 foot pounds of torque.
After the the next tank of fuel I will start hypermiling as I commute between Vegas and LA every week.
Any tips other than the obvious one of stop putting the pedal on the floor?

Just bought a Mercedes E-320 Bluetech
Been lead footing it hard around town and have been getting 31.7 with jack rabbit starts and fun with the 400 foot pounds of torque.
After the the next tank of fuel I will start hypermiling as I commute between Vegas and LA every week.
Any tips other than the obvious one of stop putting the pedal on the floor?

Slow down. Just to amaze yourself with what your vehicle is capable of, allow yourself an extra hour one trip, and set your cruise control to 55 mph the whole way.

Listerone,

Yes, it's certainly possible.

Never thought of that... Getting up at three am to leave instead of four am not fun so I will try it on the trip home. 60 MPH though as going through the Mojave at 55 wil probably get me rear ended.........

Hi Listerone:

___The 335d's FCD is within 1 mpg of actual so you are good to go and yes, 49 at close to 60 mph is indeed capable. Setting the cruise at 62 with 40-miles of non-clear Interstate probably gave you an average speed of around as displayed? We received 49 with an average speed of 62.7 mph when driving from Chicago to Madison a few weeks back in nice summer temps. I think we pulled 53.x on the way back with an average speed of 52 mph. Even in colder temps, the 335d is one hell of a Hypermiling animal as achieved in the Chicago to NY on a single tank of fuel drive last April :D

___Mmcgowan, you will not get rear ended but you will save one hell of an amount of fuel :D

___Good Luck

___Wayne