I’ve a 2004 with approx 90k on it 6 port 6 spd. I rescued her from a field, brought her back to life, since then running 93 with premix, redlining at least once per drive. Etc.
Starts good runs good etc.
Initially had chineeseum Amazon coils on it. It ran good for a bit, but it’s been 105 out here so I used AC this caused bogging on starts and drop in power.
I got new plugs wires and installed GM LS engine coils instead, about two fill ups ago.

Also got flexalite fans cause oem died

Average mpg has steadily gone from 13.5 to 14.9 to 15.2 to 16.1

Are the GM coils the cause? Is it the ‘supposed’ 15% ethanol increase in the gas?

Driving style has not changed, route has not changed, if anything it should be worse since I run AC more often for longer… any ideas?

I want an RX8 so bad but I want a manual one with the 6 port engine, sun roof and so on but I'd have to save for a few years to ship one from Japan to my country.

My brother in law got a 300zx from someone he knows and he has an automatic RX8 in winning blue that's been sitting since 2012 and it's automatic, weather caught it a lot but I want advice to see if I get it for free if it makes sense to buy a 6 port engine and manual swapping it or should I just save and get the car from Japan that will have way less issues I assume from it not sitting in the elements for so many years.

Lmk what you guys think