http://www.ehow.com/how_6495912_apply-rebate-off-road-use.html

20cents a gallon helps alittle. Can also get the refund for all off-road vehicles; lawn tractors, four wheelers, etc. Any little bit helps.

I can never get any stations to include the tax on the reciept

Tax is already calculated in the price per gallon of gas all over the country. You only need to turn in how many gallons on the form; State of Texas the refunds you the 20 cents per gallon as that is the road use tax amount.

Many don't have the total gallons either.

i thought all gas receipts included the total gallons?

Not at some of the mom and pop stores.