To answer your questions:
1. Steady at highway speeds? YES. I drove my Versa from California to Florida and back in March and except for high crosswinds at 80 mph in west Texas the car was very stable. Bear in mind the higher profile that makes the Versa a little more unstable in crosswinds is also responsible for the superior interior room and creature comfort in the Versa S or the Civic.
2. Is it safe? YES. Best safety rating overall in its class. A couple of people here have had their Versas totalled and walked away from the crashes.
3. Gas mileage? I think you can realistically expect 26-27 out of the automatic, 28-29 out of the CVT, and 30-32 out of the manual transmissions. Reported mileage varies greatly but you can look at some averages at
http://www.fueleconomy.govandhttp://www ... ta.comHigh winds are going to affect the gas mileage on the high profile Versa more than the lower profile Civic.
A lot comes down to the features, transmission, etc. you want in the car when it comes to price. Do you want a loaded Versa SL or a scaled back Civic when it comes to creature comforts for the price? If you are going to spend a lot of time in the car I think the Versa SL seats alone are worth the price over the Versa or Versa S. But that puts it closer in price to the Civic.
Anectdotally from this site and others it would seem that Nissan has weaker after-purchase support.
We went from a Civic to the Versa and we regret the decision, but that is entirely based on our needs and wants and expectations, not yours. We feel that the Versa SL is very superior when it comes to creature comforts but just an average car mechanically. The Civic seems to be stronger mechanically (our nephew bought a new one, commutes 90 miles by freeway each day and loves the car) but can't match the Versa SL interior.