Actually I'm not wrong sir. You just like to disagree with just about everything I say because I think the MS CAI is a waste of money.
YOu can tell when you are hitting boost without a boost gauge. It is simply not needed for this car! If you can't you have physical / mental problems, etc.
I'm not saying you can't get a good idea of when you are boosting w/out a gauge, but just because you can hear it spooling doesn't mean you are in boost.
Get a boost gauge, you have a turbo car. You should have one anyways, otherwise how will you notice small changes in boost or vac?
Well, I paid $4.039 a gallong yesterday and I am to the point where I am looking at a Honda fit or some other econo box. The complete lack of speed would surely cause me a slow and painful death but I need to make real decisions here. Short of converting to another fuel source, what can I do to make the MS3 more economical? Even improving only highway mileage would be a huge help since that is mostly what I do. Also, what is the worst possible thing that would happen if I put in 87 octane instead of 93?
Don't trade the MS3 in on a Fit. It will take a TON of time to break even, its not really worth it at all.
Say your MS3 gets 22mpg (average of city and highway according to listed figures), and the Fit gets 31mpg (same average of city and highway according to listed figures).
It would take you 197.93 less gallons of gas at 15k miles/year with the Fit.
If you use current Yonkers prices according to GasBuddy ($3.71 for regular, $3.99 for premium) you are only saving $925/year (approximate, $3.71 * 483.87 gallons for the Fit vs. $3.99 * 681.8 gallons for the MS3).
I am assuming you have a lien on the MS3 and are upside down, if not you are at least eating a large amount of depreciation. Either way, it doesn't make economical sense to move to a Fit, you won't see a return on your outlay for a few years. Plus, you wouldn't have the MS3 anymore.