I like the Mustang ramps. Made from 2x10's, not angle-cut.
At
http://www.mustangworld.com/ourpics/...amps/index.htm
They left 18" between steps.
Nice that you would feel the steps and know how high you are.
Since they're stepped flat you can stop as long as you're on the flat and the car will be pretty stable.
They're 30 lb. each if I recall, and not exactly low-cost due to all the wood you'll buy. Maybe 12 or 14 inch steps for some other cars, less wood needed.
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Currently getting +/- 50 mpg in fall weather. EPA is 31/39 so not too shabby. WAI, fuel cutoff switch, full belly pan, smooth wheel covers.
Now driving '97 Civic HX; tires ~ 50 psi. '89 Volvo 240 = semi-retired.