And I predict more restriction on WVO in the near future... At least, the closer we get to alternatives - the faster those doors will shut on everyone that's not on an alternative getting WVO from mr taco hut
Those sprinters are awesome when you need to move stuff frequently - and how many mpg does the f350 get? I imagine the 350 is around 17 combined (if that)? They also work well hauling too (the place I worked over the summer had two of them for hauling large equipment trailers)
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If they're going to keep the 350... I recommend that they look into a third car. If the insurance increase versus fuel savings makes in economical - find a used daily driver with at least 30mpg and bring out the 350 every other week
This is a case where renting isn't a good option and a third car might be pushing it...
If a third car is too expensive - look into an aero truck cap maybe...
All that aside - given the rhetoric about Iran... I predict things are going to hit the fan soon despite the Saudi bribe, expect fuel to hit an even bigger fan...