Originally Posted by redraptor
I'm wondering what MPG figures you guys are getting with your new 3IS. It would be interesting to note if its any better than the previous gen.
State City/Highway as a percentage.- how much do you drive on the highways and how much just local roads to the best of your knowledge as a percentage figure.
I doubt if the effect of break-in will be as significant as some people are expecting. I don't think that in new cars there is a break-in in the sense that used to apply to car engines many decades ago. It is mostly an obsolete concept, according to most of what I read about it over the past twenty or so years. There will be some loosening of the engine, but it is a slow process that occurs over tens of thousands of miles.
Everyone always wants to know if their car is getting the same mileage as other people's, and that's why this question is often asked. But it is pointless, because the difference in the kind of driving that two different people do is the factor that determines virtually all of the difference in fuel consumption.
The factor in fuel consumption that often gets less attention than it should is the number of times per week your car goes through the warmup/cool down cycle. This typically is correlated fairly well with the percentage of city driving, but even for two drivers who do mostly city driving and who drive similarly, there can be significant differences in the number of times per week the car undergoes full or partial warmup/cool down cycles.