I have an EM1 with a K20 Swap. I was wondering besides running a tune for max power is anyone running a tune for best fuel efficiency? Seems like it would be worth while to hook up the laptop to the kpro for a long trip. Any ideas or thoughts would be appreciated. Thanks in advance.

 

you shouldn't need another map if your tuner is somewhat competent and tunes part throttle.

 

agreed.. most tuners would tune street cars to be efficient in part throttle and powerfull in WOT

 

i did it for my h22 few years back, these guys are right most of the fuel savings are all in the part throttle.
After full tune on the dyno got 196whp with the crower stage2's, jdm typeS pistons.
i'm in Canada so i'm going to talk in km's On a lapping day full throttle for like 15-20min sessions i'd be getting about 250-300km's a tank.
Dailiy driving with that setup i was getting about 400-450km's a tank
after the part throttle street tune i was able to squeeze out a 600km/tank
the prelude was a pig with a 60L tank

it's kinda fun pulling the fuel it's like a game Just watch your a/f's with a wideband and just keep playing with it on either your crome or hondata. However, it's easy to just rear end the guy in front of you if you are not paying attention to the road and you are making changes on the fuel map.