Right Lane Cruiser
10-31-2007, 08:54 AM
Has anyone experienced a need to put in different offsets when moving from the SGI to the SGII? I purchased one of the newest units over the weekend when I was down in Milwaukee and finally got around to setting it up last night.
I was going to wait for the tank to finish out first but I got impatient. ;)
I put in all the same offsets, yet my morning commute returned 64.0mpg!! That seems seriously high to me, even if I did have a good run. There are only three things I can suspect.
1) Distance -- this morning came up at 22.6mi while most recently it has been at 22.4mi, though I have seen it fluctuate as high as 22.7mi before on the old unit.
2) Idle consumption -- idle is showing 0.35gph now instead of 0.4gph. Does the old unit round for everything internally, or does it just display a rounded up number? Instead of my normal 0.4g for the trip it came up at 0.35g (coincidence?) Doing the math, if I keep 22.6mi as the distance and use 0.4g for consumption I get 56.5mpg. Dropping the miles down to 22.4mi I get 56.0mpg. Much more believable and roughly in line with what I've been hitting in these temps lately (had a strong tailwind to prop it up, too). This works out to a 12.5% offset in consumption, though! Assuming the 7.9% I put in last night stuck, that brings me up to a massive 20.4%??? Even the 12.5% looks really high? :confused: Incidentally, the tank showed only 0.3g consumed in apparent conflict with the trip consumption at 0.35g... :confused::confused:
3) Behavior when dropping to idle RPM -- there is a moment when the RPMs get to about 1100 or so when the instantaneous jumps to 9999 suddenly. Then it comes back to something more normal. To the best of my knowledge my car doesn't have fuel cut and even if it did, why would it kick in at that spot while the revs are dropping in NEUTRAL? It seems that this is the spot I identified some time ago as the earliest time I can cut the engine out for a FAS and not have it diesel back on after a slightly less than 1s wait. Now I appreciate the jump allowing me to quickly negate the issues I have with long reboots in my car, but is this behavior anywhere close to normal?
Of the three, I am most concerned about #2. I already thought the 7.9% offset in the old unit was amazingly high given most people seem to be running at or less than 3%, but I'm not sure what the deal is here?
Help? :confused:
I was going to wait for the tank to finish out first but I got impatient. ;)
I put in all the same offsets, yet my morning commute returned 64.0mpg!! That seems seriously high to me, even if I did have a good run. There are only three things I can suspect.
1) Distance -- this morning came up at 22.6mi while most recently it has been at 22.4mi, though I have seen it fluctuate as high as 22.7mi before on the old unit.
2) Idle consumption -- idle is showing 0.35gph now instead of 0.4gph. Does the old unit round for everything internally, or does it just display a rounded up number? Instead of my normal 0.4g for the trip it came up at 0.35g (coincidence?) Doing the math, if I keep 22.6mi as the distance and use 0.4g for consumption I get 56.5mpg. Dropping the miles down to 22.4mi I get 56.0mpg. Much more believable and roughly in line with what I've been hitting in these temps lately (had a strong tailwind to prop it up, too). This works out to a 12.5% offset in consumption, though! Assuming the 7.9% I put in last night stuck, that brings me up to a massive 20.4%??? Even the 12.5% looks really high? :confused: Incidentally, the tank showed only 0.3g consumed in apparent conflict with the trip consumption at 0.35g... :confused::confused:
3) Behavior when dropping to idle RPM -- there is a moment when the RPMs get to about 1100 or so when the instantaneous jumps to 9999 suddenly. Then it comes back to something more normal. To the best of my knowledge my car doesn't have fuel cut and even if it did, why would it kick in at that spot while the revs are dropping in NEUTRAL? It seems that this is the spot I identified some time ago as the earliest time I can cut the engine out for a FAS and not have it diesel back on after a slightly less than 1s wait. Now I appreciate the jump allowing me to quickly negate the issues I have with long reboots in my car, but is this behavior anywhere close to normal?
Of the three, I am most concerned about #2. I already thought the 7.9% offset in the old unit was amazingly high given most people seem to be running at or less than 3%, but I'm not sure what the deal is here?
Help? :confused: