That GTP should also get very good mileage on the highway, espeically with Premium fuel, why not? You wont see much difference in an NA vehicle.

You will get better mileage with premium, possibility of damage to the motor aside.

In fact, the L32 may actually get better mileage with premium than the GT on pump rot.

And the difference per gallon is what?

With your current choices .. I would consider the fun factor and the difference if you were to run 91. Typically being the mid grade around here..it'* less than super (93).

Can the difference from regular 87 to mid of 91 be justified?

I Googled this.....

http://www.consumersavvytips.org/is_...necessary.html

http://www.epinions.com/content_2346164356

http://www.consumerenergycenter.org/...s_premium.html

I don't think those apply to anything forced induced or high compression. I

Our motors are low compression.

I have a good friend whose daughter got a new GP GT, but supercharged. I was in disbelief when she said her manual said she could run regular. Then I heard a while back on the club that it was true.

_____

FWIW (I'm speaking to everyone when I say this), I drive a total of 2 hours a day for work, and fill up once a week if I start on a full tank. I do pay a lot in gas ($200/mo. at least, $250/mo sometimes) but that'* just because of how MUCH I drive, not that I use 93. I pay maybe $4 more PER TANK on 93 than I would for regular (less than $20 more per month)...so for me, premium fuel is no big deal.

Over time that $20 adds up, so annually I could save $200 or so. My salary isn't bad, but I still basically live paycheck-to-paycheck, so I don't think that way. I probably wouldn't even save that $20/mo. for many reasons.

Many shy away from premium because it'* the most expensive fuel, but when you really think about it, it'* not that much more per tank. Unless you drive a lot more than me (25,000 miles/year) I wouldn't see premium fuel being a huge concern. If you're one who likes to save every penny then premium may not be for you. For someone who may want a supercharged car for a little more fun, but who is afraid of the word "premium," there really is no huge reason to be worried by it.

But forced induction, which in essence simulates the conditions of a higher compression ratio.

I'm sure you can run on it but it doesn't seem worth while to save a few cents per gallon. I had a friend in highschool who had a stock GTP and only ran 87 with no engine damage. Thats putting alot of trust into the knock sensors, programming in the PCM.

I would stick with 91+ min..

Ed

She'll be doing about 25000 miles a year.