Day Time Running Lights & MPG - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Day Time Running Lights & MPG
Posted by Bruce (more from Bruce) on Sat, 14 Jul 2012 09:48:51
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1999 Saab 9-3 base auto with 191K miles. So based on some other discussion, I decided to pull fuse 15 to see how much the DRLs where affecting my MPG (for easy comparison just using my SID). During the week my driving is strictly commuting, 26 miles round trip, (about 130 miles/week), with the occasional stop along the way (gas, groceries, etc). Normal summer driving is somewhere between 23 & 24 mpg, depending on traffic, how I hit the lights, etc. This week, after pulling the fuse Monday morning, it was 25.6 MPG. I realize in this testing the margin or error is likely pretty wide, but 1.5 to 2mpg is still pretty big difference. So can the electrical draw on the alternator by the DRL really decrease MPG by about 2mpg or 5-7.5%?
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