Well, since I have driven a cvt for a year, I can say that on a highway I could get a solid 63mpg and even 75 drafting behind a semi. It's not easy at all to do and semis do not like you drafting them. Now, let's take into account that the speed limit is 70. At that speed my best was 50 somthing, maybe 52 at best. In traffic stop and go and part way speed limit 55, my best was 53. I never aired up my tires past 50.
On this manual that I picked up in California, thanks to one of the former forum members, that thing with a dead IMA got a solid 78MPG going from Laguna Hills to where Hasport Motorsports is on less than 3/4 of a tank and then after filling up going up into the mountains great mileage (of course with no IMA it was limp mode through the grades). I couldn't be happier. My first thought was to simply kswap this thing instead of the cvt but I couldn't bring myself to it. The cvt could use a swap. I think the money spent to the actual MPG I would get from a lithium swap and new mounts, and probably flywheel soon, to get it to actually be tip top and the money spent to get a set of mounts and kswap...pretty much a kswap would be better money spent. I can get a k20 here fairly cheap the way these kids can't handle the vtec truth. I digress...