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!

I would expect 26-28. Hve you checked the O2'* lately?

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.

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).

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.

I am highly curious, then, why there is such a big difference in the same era vehicles?

TelePlayer, does yours have the EGR?

Yes, it has EGR

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.

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.

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?