I own a 2002 Ford Ranger pick-up and use it for work and pleasure. I have noticed that on a motorway run, at 70mph it is running at just over 3,000rpm. I realise that it is a 4x4 and is therefore lower geared for better off-road performance, but I was wondering if I could do anything to lower the engine speed? I tow a 2-tonne trailer for work so was thinking that changing the gear ratios might not be a good idea. I was thinking about the possibility of doing something to the wheels. At the moment it is on 15-inch wheels with a 75-profile tyre and I wonder what difference it will make if I go up one or two inches and keep the 75 profiles? The main reason for doing this is to reduce engine speed and hopefully the fuel consumption too.