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Old 01-20-2019, 03:23 PM   #34 (permalink)
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ND Miata - '15 Mazda MX-5 Special Package
90 day: 39.06 mpg (US)

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Originally Posted by mpg_numbers_guy View Post
As a relevant comparison, between today and yesterday's trips my Insight got 82.9 MPG driving on "normal" roads (flat + slight hills) and "only" 73.7 MPG through mountain passes. MPG was lower because I couldn't maintain lean burn for 80%-90% of the passes.
I have to wonder if your mountains aren't smaller than ours.

When I was down in MA my fuel economy improved from ~58mpg to upper 80's. It was a little warmer but I expect most of that is from things being less mountainous. It's frequently necessary to be in 3rd gear WoT to maintain speed in my car on Vermont highways, forget about lean burn.
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