Aside from the EGR issues Kruse/Lucas caused when they frankensteined my car, they installed the wrong ECU unit. Kruse/Lucas is a Used car dealership that I don't much like after seeing how they've "repaired" my car. My parents bought it initially back in 1999 for 7K$. It's a 1990 740 turbo.

I was looking around my car and the Bosch website and used their parts locator... I have the wrong ECU installed. The Bosch site lists 0 227 100 145 as the right ECU for a 90 740T and I have a 0 227 100 124 installed. The same parts finder says this is for a pre-89 car.

What sorts of things would this explain?

I've got the 0 280 000 560 primary computer installed. This should be fine, as it's interchangeable with the -563. My car is a California car and has EGR. I found this info at:
http://billgarland.mcmaster.ca/volvo/database/ECU1.htm
But I'm not sure I'm reading the table right. I do have a cali car.

I've gotten in contact with a (new car) dealership here in town called Modest European. They should be getting back to me tomorrow.

I appreciate any input. Could this be making for 18.5-21 mpg?
(Maybe I should take a trip to small claims court in the future?)

-Will
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1990 740 Turbo, on its way to stock specs, maybe beyond