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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Fuel economy dropped suddenly ('06 325i)

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      05-09-2011, 12:55 PM   #1
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Drives: TBD
Join Date: Nov 2008
Location: Texas

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Fuel economy dropped suddenly ('06 325i)

This is weird. I routinely average somewhere between 21.5 and 22.5 mpg on a tank of gas according to the electronic dashboard gage. If I fuel up somewhere along the highway it may start in the upper 20s, but it quickly converges to the average of around 21.5-22.5 mpg with the combo of city/highway driving I do, and stays fairly constant until I fuel up again.

Saturday I filled up with premium (93 octane) about an hour outside of Houston. I didn't notice anything unusual, and the mpg appeared to be converging to the usual range. Today on the way to work, I noticed I was at somewhere around 19.1. Very unusual. I did a fair amount of in-town driving on Sunday, but it is almost never the case that my average will fall below 20.

The place I filled up at WAS a sort of a large econo/truck filling station. Bad gas?

Incidentally, on the previous tank I tried a mid-grade (89 octane) from a quality brand (Shell) and I actually averaged over 22mpg, which was slightly better than I usually do on premium.
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      05-09-2011, 03:02 PM   #2

Drives: 2009 E91 328xi 6mt
Join Date: Apr 2009
Location: Raleigh, NC

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do a few more tanks then see what it says. I track my MPGs with fuelly, might not be a bad idea for you too.
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