 I purchased this car with 58,000 miles on it and it is a five speed manual transmission. I only opened up the exhaust and installed a Tornado fuelsaver (for whatever thats worth). I burn Mobile one full synthetic oil in it changed at every 8,000 miles. For some time now I use the car 100 miles five days a week to commute my non-driving wife to work. I have done "nothing" to the car basically except put gas in it.  Gets anywhere from 31 to 34 mpg on highway, and shifts out of third gear at 103 mph! Uses one half a quart of synthetic oil every 8,000 miles. If you see a white 1998 Nissan Altima in northern Mo. to Southern Iowa screaming down I-35 highway, that would be me!