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Old 08-12-2004, 06:02 PM   #1
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Default Gas Mileage Question

I have a 93 SSEi that has been rebuilt about 35,000 miles ago. Car has 175000 or so on it. I have a 30 minute commute one way at 70 mph speeds and a few miles of "in town" driving at both ends of the commute. I don't normally drive real aggressively, but every now and again surprise a Bimmer driver. I consistently get 24.5 mpg. Once on a long interstate highway trip got a whopping 25 mpg. I have read a few comments on other threads that say 29-30 mpg on the highway....etc. yada, yada. Question is: What mileage is to be expected on the stage 1 SSEi? Follow-on would have to be if my mileage is lower than it should be, what could be wrong? Note: I keep it tuned up, new wires, new coils, etc. Thanks!
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Old 08-12-2004, 06:04 PM   #2
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I would expect 26-28. Hve you checked the O2'* lately?
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Old 08-12-2004, 07:00 PM   #3
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Only one O2 sensor on a 93, but that'* a good point. Was it replaced with the engine, or is it older? If it'* over 50,000 miles, I'd replace it. If it wasn't an AC Delco, I'd replace it. That could be good for 1 or 2.

Don't expect 29-30 until you have a few mods. Particularly the intake and exhaust.
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Old 08-12-2004, 08:43 PM   #4
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heheh, I knew that. I don't know why I went plural. (Actually, it was singular, personal possessive, which makes no sense....definite typo... )

Alot of times, the sensor can start to go bad without tripping the SES light. One sign can be when you get on it, you smell a sulphur-like odor, because the mixture is slightly rich. (Although that can also be a sign of a failing cat).
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Old 08-12-2004, 08:52 PM   #5
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My '92 is basically stock, and if anything it runs lean. I get no more than 23 on the highway, so I don't think you have a big problem.
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Old 08-12-2004, 08:55 PM   #6
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I am highly curious, then, why there is such a big difference in the same era vehicles?

TelePlayer, does yours have the EGR?
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Old 08-12-2004, 08:59 PM   #7
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Yes, it has EGR
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Old 08-12-2004, 09:07 PM   #8
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Default Re: Gas Mileage Question

Quote:
Originally Posted by stever
I consistently get 24.5 mpg. Once on a long interstate highway trip got a whopping 25 mpg. I have read a few comments on other threads that say 29-30 mpg on the highway....etc. yada, yada.
My commute sounds very similar to yours (28 miles of which 24 are on the highway) and I get 23-25 mpg in a 1994 SSEi. Your fuel economy seems completely normal and I wouldn't go replacing sensors unless your check engine light is on.

Probably the biggest contributors to fuel economy that you can control are driving style and tire pressure.
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Old 08-12-2004, 09:11 PM   #9
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Good words, there, Titanium. Alot of people overlook the tires.

I'd also suspect that the 92 SSEi'* in GENERAL would tend to have a little worse fuel mileage than the 93-95.
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Old 08-12-2004, 09:35 PM   #10
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So...it'* completely normal for one 93 SSEi to get 21-24 mpg, and another to get 27-29?

I got my 28 mpg when i picked up the car, and it was always that before I added the pulley and plugs.

What could cause two cars that are virtually the same have such a big difference?
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