Cadillac Seville / Cadillac Eldorado Forum Discussion, 14.5 Average MPG in Past Cadillac Vehicle Discussion; hey George please post in the main Seville/Eldo forum... or even the 4.9L forum.
Your post is lost in here...
...I have read in this forum that its good to practice about once or twice a week...
The frequency of the WOT should be reasonable.
No need to do WOT so often if there are no black smoke from exhaust. Make it biweekly and see if black smoke comes back. I bet you'll not see it. Do that as often as you get any black smoke.
Just my 0.02.
I'm hardly an expert. I've only had my '95 ETC since August of last year. I haven't had a problem with it at all, ecept it gets dirty when I drive it in the rain. Apparently Cadillac has'nt addressed that problem, yet.
Try this........Fill your tank and reset your MPG indicator. Then, if you can, turn off the display and drive the car for the full tank. Pay no attention to the display. That will be your average mileage. It will not have anything to do with the previous indication.
I drive 50/50 highway and local. I am averaging 22 miles to the gallon. When I first got the car it appeared to be stuck below 16 mpg. Once ir was reset, I became a very happy camper.
First off you just bought the car so the MPG will be low for a little while. Mine was down 14-15 for a while when I bought it, now I am around 16.2 overall and I like to get on it. Don't expect higher than 16-17..it is a STS.
The WOT runs are for Northstar engines to keep the rings free. They tend to use oil when the rings are carboned up. You really don't need to do it on a 4.9, they're usually much better on oil consumption.