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Old 03-24-2013, 03:32 PM   #35 (permalink)
wobombat
EcoModding Lurker
 
Join Date: Sep 2012
Location: Oakland, CA
Posts: 44

Lincoln - '00 Lincoln Ls
90 day: 24.29 mpg (US)
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Iamian you pose a good point. In order to maintain the same average speed with p&g as in steady state driving, you need more energy. This is because air resistance increases exponentially with speed.
Another detraction from p&g, older engines suffer from compression loss. I haven't confirmed this and I haven't seen this on this site, but when you p&g you are trying to hold larger pressures in leaky cylinders, so more pressure is lost, therefore more gas used
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