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Originally Posted by billrei
I've had my 300TD somewhere over 85 mph with the needle pegged on the I276 Raceway coming out of NJ. The car does not have a tach but motor didn't seem to mind the speed. But then again my 250SE pulls over 5,000 rpm at that speed. Is there any chance I could decrease my mileage with the 2.88 gear? I guess I would have to have a cheat sheet handy with actual speeds.
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It all depends on how you drive. The 2.88 is an ideal gear on the highway. I allows the engine to stay below 3K for most driving conditions. It's much quieter with the engine turning slower. You will definitely improve its highway fuel economy. Of course, you need to realize that you may need third gear if you start up a steep grade. This means that you can't go 75 mph anymore up the grade if you drop down into third because the revs will get too high. So, if you don't mind going uphill at 55-60, on certain upgrades, then the 2.88 would be fine for you.
Additionally, you must realize that you take a hit in terms of driveability in the city. The vehicle will feel much slower on takeoff and you will find yourself mashing the pedal to make it go. It probably takes off from a standstill quite well with the 3.46. You will definitely notice the difference with the 2.88.
So, my advice is based upon whether you want it as a highway cruiser or a city vehicle. You cannot have both.