I haven't gotten much useful info from any gauge except fuel light and of course oil since only way to check.
If you want info get scanguage for water temp, current ( short term ) mpg, and real MPH.
You can discover that the engine runs hotter when you cruise, but cooler when beating on it: brilliant idea.
Once, I got 42 mpg for 70 miles at about 65-75 mph ( some tailwind).
For one long hot day at 80 mph I got 23 mpg.
I can cruise through town with stop lights and get better than 23 mpg.
For the speed and powewr mpg is excellent on my s28i.
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