I had 268 cams with a C2 tune, which was alright good power after like 4k -6.5 or so,
But recently I snapped a cam and had to go back to stock, and man was I missing out on the low end haha.
stock cams now that i have run both 268 and stock, are the better choice for a daily, the 268's in my case were only good for highway pulling and poor milage because you have to keep it up there in the RPM's
My car also averaged about 21.2 MPG with the 268 setup which was meh at most. that was with regular driving some hard driving some relaxed driving.
My car also has a 10lb flywheel and a SP short runner so that could also contribute to the lack of low end but still. From a straight comparison the 268's wernt as fun as the stock cams.
Cars also got a 02m so I can realy take advantage of the low end power.
If you are staying N/A I wouldent bother with any fuel mods little to no benefit.