2003 Bonneville SSEi 0-60 6.8s
2004 Bonneville GXP 0-60 6.8s

Ok so.....less fuel mileage, more power... same performance.......

Not to mention the L67 has twice the capability, thanks to it not having a 10:1+ comp ratio.....

whats the ssei running in comp. ratio? if its under 9:1 it shouldnt need premium... th gxp would..

Im asking, besides the fact of being able to say "your paying more in gas, your engine sounds better"

What the hell are the gains in this situation??

Actually, the Northstar engine has much more capacity for performance. There are custom built Caddy engines pushing out 1000 HP in street applications. You cant do that with a 3800 unless you have more money than brains. In either case, the tranny is the limiting factor in what you can accomplish.

As far as the "equal" performance, I can't answer that, I can only assume that the added power came will an increase in weight that cancelled out the short-term benefits. Or, perhaps, the test driver couldn't run the car through its proper paces.

You might break even on the gas deal. Since the GXP doesn't require premium, you may end up paying the same in gas, even though you are using a bit more.

GXP is running 10:1... so it need premuim

The SSEI is supercharged and needs Premium. I don't know about the GXP.

The SSEi has 8.5:1 compression ratio, but IT IS SUPERCHARGED so it requires premium, because using a power adder is like raising the compression ratio.

Both the GXP and SSEi require premium, and they both perform the same 0-60 because of the extra weight from the GXP having a bigger engine and all, but the GXP uses the 32 valves to its advantage and performs better in the 1/4. The GXP is going to use more gas because it is a larger engine, but it also has a LOT more potential.

Shawn

The GXP does not require premium.

And neither does the 2004 Grand Prix GTP, but it would stupid to not use it. If you look at the compression ratio for the engine, it is obvious that it needs premium. GM just programs the computer to pull timing and everything when there is knock so that regular can be used. The only reason they say it doesn't require premium is so that they will sell more of them. To get optimal performance from the engine, you should use premium.