g1smd - 9:15 pm on May 21, 2012 (gmt 0)
Where are $1 and $2 being populated from?
You have no "captures" in your rule. $1 and $2 can appear only in the rule target, not in the pattern part.
RewriteBase / is the default and can be omitted.
RewriteRule should be looking for
gases.php and the preceding
RewriteCond should be testing QUERY_STRING or THE_REQUEST for
RewriteRule target URL should contain protocol and domain name.