[mrlmd1]

The volume expansion of gas between 35 and 70 degrees is insignificant - I just looked it up on the web and the standard coefficient of gasoline expansion/contraction is 0.069% per degree F. (0.00069/degreeF), and on another site it says the volumetric coefficient of expansion of gasoline is about 0.058%/degree F. (.0.000528/ºF). That's even less.
Using the higher figure of 0.069% expansion/degree F = 0.00069 x # of gal in full tank (say 3.4 gal in full tank) x 35 degrees temp diff = 0.08 extra gal., or less than 1/10th of a gal. difference with 3.4 gal at 35 compared to 70 degrees. Don't worry about it, and don't even think about it, you are not going to be filling up the tank to the very tippy top anyway.
And the fuel in the inground tank at the gas station is pretty much at the same temp all year long when you fill up anyway so you would be getting for all practical purposes the same amount (volume) of fuel each time, whatever the meter says, irregardless of ambient temperature. There may be a difference between Canada in the wintertime and Arizona in the summertime in the amount of gas you get per the meter read, but in one locale, the difference is minute.