Best case EPA numbers 14 City, 16 Combined, 18 Highway. If it's all highway miles a 1mpg increase is: (35000 / 18 x 3.5) - (35000 / 19 x 3.5) = $358 saved. Anything to help will save a lot of money.
Best advice is to adjust the nut behind the wheel and drive slower. Doing 5 or 10 under the speed limit in top gear will net the most percentage increase in mpg aside from aeromodding. It might also help the sightseeing!
The more people you have to split the gas bill the more economical the whole trip will be. A few people will raise the effective mpg per person of the vehicle.
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I try to be helpful. I'm not an expert.
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