>> Re: Poor MPG on a 1990 2.0L 16v Unless you've got an aftermarket chip, I suggest trying a tank of 89-octane midgrade. I know, I know...but seriously, when I did it with my Jetta the MPG went up noticeably. I get about 30mpg on the highway now, whereas I used to get about 26 using 92-octane. I'm not sure why this happens, but it's true! <<
Higher Ocatne gas is designed to eliminate "pinging". It does this by "slowing down" the flame front. It actually burns worse than lower octane gas. However, if the ignition is advanced to take advantage of the reduced pinging - well then the higher octane allows more power by increased ignition timing. The ads that suggest running "premium gas" are really designed to sell the more expensive (and probably higher profit margin) gas. However - not being familar with the "knock sense" ignitions, Im not sure how far back the timing is pulled when pinging is sensed. Thus I dont know if bumping the timing up and running "marginal" gas is an advantage or not... EWong _____________ List Sponsor: http://www.netsville.com To remove yourself from this list, send mail to [email protected] with 'unsubscribe a2_16v' in the body of your message See us on the web at http://www.a2-16v.com Visit the 16V Homepage at http://www.gti16v.org
