The BUDGET is always affected when the price of anything included in the budget goes up UNLESS you simply adjust your behavior a little to compensate. In other words simple drive less miles. Do more hiking, biking, boating, camping, walking, swimming, skiing, fishing, hunting, photography, loving, eating and playing INSTEAD along the way.
I would LOVE to purchase a hybrid van to help increase my fuel mileage but budget does not allow at this point. The cost savings in fuel would not exceed the initial increased expense of the more technologically advanced electric vehicle. Though some research into whether you could convert a vehicle to run SOLELY on solar power would be warranted for those with the time. I would highly recommend you also reread the "van" chapter in Vanabode as there are many important reasons, come critical to success on the road, for my choosing and recommending the exact kind of van I use.
You may also find best camping vehicle and Vanabode strategies without a van helpful.