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there are a couple kinds of hills some are good some are bad.
slightly hilly roads up and down. help pulse and glide remain at a steadier speed so as to annoy other drivers less.
only round trips count for the next statements
bad hills are so steep, or have obstructions at the bottom so as to require the use of brakes. glide down engine off then waste energy with brakes. then on the drive up low MPGs
good hills are steep enough for steady speed engine off then can coast down or continue on your way. On the way back up if you can get better than half your flat ground MPG then your doing well.
I can think of quite a few of both types of hills in my area.
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