Well thanks for the data points guys, except for lbrown.
Here's a .csv file using - for delimiter and " to wrap text, and make it slightly readable.
"make"-"model"-"hp"-"gal/hr"-
"mahindra"-"?"-26-"<1"-"george2615"
"kubota"-"?"--"10gal/month"-"lbrown"
"kubota"-"?"-21-0.5-"BruceWard"
"kubota"-"
bx2350"-23-0.5-"smallfarmer"
"kubota"-"
b7500"-21-0.6-"rusty"
"kubota"-"
bx24"-23-0.33-"oldertoday"
"kioti"-"ck25"-25-0.5-"sunnyjim"
"jd"-5103-45-0.75-"rwolf"
"kioti"-"ck20"-23-0.5-"garydc"
"jd"-3320-32.5-0.47-"zr2blz"
"jd"-4010-18.5-0.46-"ralphva"
"mahindra"-3525-35-0.75-"xlr82v2"
It looks like the 20 to 24 hp burn about .5 gal per hour. Except for Lbrown who gets about a month on 10 gallons.