bro. go for G15 swap with even thinking 1 sec. i have swapped g15a for 2 year. never ever a single problem. corolla se to match hi ni but also no civci can beat it on motorway. i never race with civic on highways due safety reason but but in my 5 trips to isl from lhr, i drove it continuously above 160 to 190. u can say stability even at 190 on motorway was just like corolla. never felt out of control or unstable. as far as fuel ave. i have got max 21.7 km at speed of 80 to 90 on highway. but mostly i cruise it on highways at speed of 120 to 140 not less than this still getting 17. now comes to city, never got more than 10 km/ltr. not less than 10 also in city with a/c. i can guide u about swap whenever u want. will pm u my cell no. first text me about ur no. with ref. to pakwheels. then call.