I hate the throttle 'delay off' on mine too- I hear it was one way they got such exemplary epa rating on this little monster, but it definitely gets annoying- first day I had it, noticed its exactly SIX seconds after lifting before full engine braking kicks in- except if its 55-60 degrees then it engine brakes immediately until engine warms slightly- even burbles/backfires a bit

if short shifting rpm can actually shoot up a little at pressing the clutch in- 2-2200 rpm seems where mine likes to hang.
Ive read most of the delays can be tuned out, but I'm a little worried about both MPG and warranty- aside from the kinda numb gas pedal feel, everything else about driving it is a blast- well the third gear gate dont allow powershifting very easily, but other than that...My first mech mod desired would be probably the shifter- barking third is just too tough. next on the want list would be a roots type blower for another 100 ft-lb, as this one is lacking a bit of off idle pull, but with the 5 speed, its not a problem...
regarding mpg- I got >24 on two road trips a couple weeks ago- including half-dozen scorched onramps

Ive heard 26 is easy to average at 75-80 mph, and dont doubt it a bit...one guy on another forum added a shaker and now says he's getting around 30. next up- true cold air/hoodscoop...