Mine is a N/A engine and I drive it hard, and I fill it with shell 91 octane only. 36 mpg on the highway traveling at around 75-80 mp/h or 120-130 km/h. I would think you should be able to get 32-34 mpg with the right mods and probably better than that if you keep the speeds reasonable. My city/hwy combined is 29 mpg.

 

Changing the supercharger oil today! Gonna seafoam the fuel tank and vacuum lines this friday. You guys are a lot of help!

 

Hold off using seafoam on the vacuum lines.

I have heard it can ruin the coating on the rotors of the supercharger. You should try to research that a little first.

 

there is a trick to that you know the lawn hand pump sprayer to spray fertiliser you can use that in the aprayer and spray it in the intake minuse the maf. but i will sugest like chibi aka mike said look into it so you wont harm any thing

 

Okay, I'll just add to the fuel tank for now. That's the last thing I want happening. The oil replacement in the supercharger went well. Squirted it all out with a clean spray bottle and added the new stuff. (The old oil really does stink, some of it got on my fingers) :/

Thanks for the heads up though, Chibi.