Quote:
Originally Posted by Diesel_Dave
Hmm, I'll see about justifying it that way. I'm sure I'll give in and but one eventually.
As far as weather and traffic go, I know they make a difference, but what I'm talking about is 2 days which seemed (at least to me) to have similar traffic, similar weather, similar driving style and 1 day has much better FE than the other.
What I'm trying to figure out is 1) Is the FE difference real, or just my computer 2) If it's real, what's happing on the good days to make them good (so I can do it again).
What made me think of this is that I set a new daily commute record today. 43.0 mpg. Previous record was 41.0. My average for this setup has been about 37-38. If it's real I want to do it again! BTW, I know it reads around 10-15% high (on average).
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From what I can gather from my 2008 Nissan sentra, the trip calculator uses the exact same data as the scangague. The trip calculator on the car seems fairly inacurrate and speratic shortly into the trip but once it settles in, the tip on the SG and the car are identical. I know the SG is accurate because I have verified that tank after tank. I suspect your variation comes from other factors. Those "other factors" are whare the SG really shines. Sometimes you I don't know that the wind changed or I am giving too much gas on a hill untill I see my SG display a sad number and I use corrective acction.
Having said that, even with the SG, I find some days it's a stuggle to get the MPG's up and sometimes it's easy. There are so manny variables. I find I tend to set my MPG reccords near the end of the tank. "Getting lucky" on the lights to prevent full stops it HUGE and you don't realize how big a deal it is untill you get a SG and see your mpg's drop to single digits as you get up to speed.
To sumerize, get a SG! You will be glad you did. The sooner you get it, the sooner it will pay for it's self. I was able to pick up 2 mpg imediately when I got mine, and much more since then. I only drive 150 miles a week but I estomate it will have paid for it's self in 12 months. Not bad!