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The easiest changes are the lower grill block and solid wheel covers, like moon disks.
The grill block alone is worth 3% improvement at hwy speeds.
I did the griill block on my 2006 mazda 5, blocking no more than would still let the car run at normal temps during summer use,( about 2/3rds blocked) and I still saw the 3% gain, going from 30mpg to 31. ( cars rated 27mpg hwy).
That jumps my hwy range from 450 to 465 miles, which is like getting a free extra 1/2 gallon of gas every time I fill up.
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