Quote:
Originally Posted by Old Mechanic
While the claims may stretch the limits of credibility, maybe YOU should look at Diesel Daves Mileage in a similar size-weight truck. Close to 50 MPG. I'm not saying it is true or false just that we should see what has been done and the driving technique used before calling someone a liar.
regards
Mech
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Just to set things straight, I've done over 50 on the overhead before, but this last tank has been the first time I've done over 40 mpg hand-calculated. Also, the Excusion comes in at 7,700 lbs curb weight, which is ~1,400 lbs heavier than my truck. That being said, we're talking about highway fuel economy, so weight isn't as big of a deal.
With regards to whether it's possible to do what the OP has claimed, I definitely say it's possible (based on my own experiences). That being said, I need to add a few things.
1) There's a huge difference in getting 32 mpg on one trip and consistantly getting 32 mpg. Note that the OP didn't claim he was getting 32 consistantly.
2) Related to the one trip thing, it's important to keep fill variations in mind. If we were looking at a long term fuel log that accounted for evey mile driven that would be one thing, however, on a large vehicle like this you can easily get 2-3 gallons of fill variation if you're not careful. That can easily add +/- 10% to/from the mpg numbers. So maybe 32 mpg is actually 29 mpg.
3) This was a one-way trip, so factors such as wind speed, etc. may have biased the results.
4) Has the OP verified the odometer. If he's changed tire size that can affect the numbers as well (both hand-calculated and from the overhead).
5) The OP says that he's "verified" the overhead display. It's sounds as though this was based on a one-time check. In my experience those things have a lot a variation built into them. I'd have to see some consistant comparisons over many tanks to trust the numbers (in terms of the absolute values).
6) Some one suggested that they'd like to see a video of a Scangauge. A SG is calibratable, so that wouldn't prove anything.
So, in summary, I think the OP's claims are believeable, but I'd like to see some more evidence. Assuming he is telling the truth, I'd like to offer him congrats!